12.1. EtherCAT Overview

EtherCAT is a real-time Ethernet network protocol developed by Beckhoff Automation for communicating among multiple nodes. EtherCAT networks are formed using CAT5e cabling, where master and nodes can be directly wired together through RJ-45 ports, in a daisy chain configuration, without need for external networking switches.

Software generates master/slave configurations by loading a EtherCAT Slave Information (ESI) file. Magna-Power Electronics provides this ESI file (XML) to customers which contains identifying information, exposes functionality, and stores settings.

Magna-Power Electronics has implemented and tested the basic EtherCAT protocol and Ethernet over EtherCAT. Additional protocols over EtherCAT (e.g., CANopen over EtherCAT (CoE), File Access over EtherCAT) may work, but have not been tested, and therefore are not supported.

12.2. Data Objects

12.2.1. Process Data Objects (PDOs)

PDOs are real-time data frequently sent to and from connected Magna-Power Electronics devices. When describing PDO traffic, it is referenced with respect to the EtherCAT slave device. For example, Transmit PDOs (TxPDO) are transmitted from the slave and are read-only, while Receive PDOs (RxPDO) transmits variables to the slave and have write access. Measurement reads would be mapped in the TxPDO Mapping, whereas set points would be in the RxPDO Mapping.

12.2.2. Service Data Objects (SDOs)

SDOs are messages sent on request and have no timing expectations. SDOs are intended for non-real-time communications, as they must wait for the network to respond, and are typically used for reporting status, changing operating modes, and etc. RxSDOs variables should not be used to update values already part of a PDO, as they are updated regularly, and the values would be overwritten by the RxPDO.

12.3. EtherCAT State Machine

The master controls slaves by following the EtherCAT state machine. Slaves can transition between four states: Init, Pre-Operational, Safe-Operational, Operational. In each state configuration checks are made and types of communications opened. The transition between states are diagramed in EtherCAT state machine. Allowed communications in each is described in Allowed protocols for each state. Devices enter the Init when first switched-on and reaches Operational under normal conditions

Fig. 12.1 EtherCAT state machine

Table 12.1 Allowed protocols for each state

State	RxSDO/TxSDO	TxPDO	RxPDO
Init
Pre-Operational	✓
Safe-Operational	✓	✓
Operational	✓	✓	✓

12.4. Development using TwinCAT

Communication was tested with Magna-Power Electronics devices using software called TwinCAT 3 (version 3.1), which enables a personal computer to communicate over EtherCAT and act as a PLC master. Software is available for download on the Beckhoff Automation website using the link.

TwinCAT 3

A dedicated EtherCAT network is needed, segregated from the local TCP/IP network, as the two protocols are not compatible. In the examples, a separate network interface card (NIC) was installed just for EtherCAT communications. Specifically, an INTEL 8255x based NIC, as recommended by Beckhoff for real-time communications and compatibility with TwinCAT 3 software.

After installing the NIC and TwinCAT 3 follow the Windows driver installation guide on the Beckhoff website so that NIC is treated as a TwinCAT network adapter.

12.4.1. Project Configuration

A project file stores connection settings for each EtherCAT device which helps with application development for multi-device networks. The following steps walks through creating a project — the same used in the examples section.

1. Open the TwinCAT XAE Shell (TcXaeShell) application and create a new project by clicking File > New > Project and select TwinCAT XAE Project (XML format).

2. Download the Magna-Power Electronics ESI file below, save to the TwinCAT installation directory (default is C:/TwinCAT/3.1/Config/Io/EtherCAT).

Magna-Power Electronics ESI File

3. The Restart TwinCAT (Config Mode), Toggle Free Run State, and Show Online Data buttons should all be pressed, as shown in Fig. 12.2.

Fig. 12.2 Project running configuration

4. Navigate from the top to TwinCAT > Show Realtime Ethernet Compatible Devices. There are three possible scenarios:

1. If a TwinCAT adapter was already installed, it will appear under Installed and ready to use devices(realtime capable) tree. No additional setup is needed, as shown.

2. If a TwinCAT adapter is available but not installed, it will appear under Compatible devices tree. Select the desired network adapter and press the Install button, which makes it appear in Installed and ready to use devices(realtime capable) tree.

3. If a TwinCAT adapter is unavailable the Compatible devices tree will be empty, which indicates computer was unable to detect a compatible NIC.

Fig. 12.3 Adapter installation

5. In the Solution Explorer panel expand the I/O in the project tree. Right click on Devices and select Add New Item.

Fig. 12.4 Add new device

6. In the Insert Device window, select EtherCAT Master.

7. Under the devices tree Device 1 (EtherCAT) should be visible. Right click on the device and select Scan. If the Magna-Power Electronics device is found, called Box 1 (Anybus CompactCom 40 EtherCAT) will be added as a BLANK to Device

8. Verify device configuration by double clicking on Box 1 and selecting the Online tab. If successful, the field labeled Current State will show OP, indicating the Operational state.

Fig. 12.5 Operation status online tab

12.4.2. PDO Communication

TcXaeShell provides a couple options for reading PDOs

1. In Box 1 - Transmit PDO Mapping, PDO variables are listed. Select a variable and open to the Online tab to see that variable plotted in time.

Fig. 12.6 Graphing of a PDO varaible

2. Selecting Box 1 a list all PDOs are presented. Note that WcState, InputToggle, State, and AdsAddr are TwinCAT specific variables and can be ignored.

Fig. 12.7 PDO variable listing

TcXaeShell provides a couple options for writing PDOs

1. In Solution Explorer click the desired variable in Box 1 - Receive PDO Mapping and open the Variable tab.

2. The same can be accomplished by right clicking on the variable and selecting Online tab and the Write button, which also graphs the value over time.

Fig. 12.8 Writing PDO from the Online tab

The Set Value Dialog provides entry using multiple number formats. On change, all the fields will update such that numbers are equivalent. Write value dialog shows equivalent fields for a Float value of 3.7588999. Based what the PDO/SDO variable represents, users may elect to use integer number formats (Dec, Hex, or Binary) instead. Note that byte ordering is swapped for Hex versus Binary.

Fig. 12.9 Write value dialog

12.4.3. SDO Communication

SDO variables are listed in Box 1 and accessed by entering the CoE - Online tab. The variables listed in table form are extensive and some time is needed for them to load. To write to an SDO, double click on a variable in the table to open the Set Value Dialog window. Only variables with Flags RW (read/write) can be written to. Variables that are RO (read-only) or a PDO cannot be written to.

Fig. 12.10 SDO CoE - Online tab

12.5. Standard Object Dictionary

The physical interface to EtherCAT network is performed with an Anybus CompactCom M40 Module installed internal to the ALx Series. The module supports CANopen over EtherCAT and complies with draft specification of CiA 301. The specification calls for services and standard data object implementations outlined in the reference material below. The data objects reside in allocated address space shown in Data object dictionary

CiA 301

Network Interface Appendix Anybus CompactCom EtherCAT Doc.Id. HMSI-168-65

Table 12.2 Data object dictionary

Index	Object
0x0000	Not used
0x0001-0x001F	Static data types
0x0020-0x003F	Complex data types
0x0040-0x005F	Manufacturer specific complex data types
0x0060-0x007F	Device Profile specific static data types
0x0080-0x009F	Device Profile specific complex data types
0x00A0-0x0FFF	Reserved for further use
0x1000-0x1FFF	Communication profile area
0x2000-0x5FFF	Manufacturer specific profile area
0x6000-0x9FFF	Standardised device profile area
0xA000-0xBFFF	Standardised interface profile area
0xC000-0xFFFF	Reserved for further use

12.6. Manufacturer Specific Instances Listing

ECAT Command	Write Index	Read Index	Description
Operation Commands
StatusQuesQ	N/A	0x200B	Returns the value of the Questionable Status register
StatusRegQ	N/A	0x200D	Status Register
Input	0x2011	N/A	Enables or disables the DC input based on parameter setting
Measurement Commands
MeasCurrQ	N/A	0x2101	Measures and returns the average current at the sense location
MeasVoltQ	N/A	0x2102	Measures and returns the average voltage at the sense location
MeasPwrQ	N/A	0x2103	Measures and returns the instantaneous DC power at sense location
MeasResQ	N/A	0x2104	Measures and returns the instantaneous resistance at sense location
Setpoint Commands
SetpointCurr	0x2201	0x2202	Sets the current set-point
SetpointVolt	0x2203	0x2204	Sets the voltage set-point
SetpointPwr	0x2205	0x2206	Sets the power set-point
SetpointRes	0x2207	0x2208	Sets the resistance set-point
Trip Commands
OverTripCurr	0x2301	0x2302	Sets the over current trip (OCT) set-point
OverTripVolt	0x2303	0x2304	Sets the over voltage trip (OVT) set-point
OverTripPwr	0x2305	0x2306	Sets the over power trip (OPT) set-point
UnderTripVolt	0x2307	0x2308	Sets the under voltage trip (UVT) set-point
Slew Commands
RiseRampCurr	0x2401	0x2402	Sets the rising slew rate for current when in current regulation state
RiseRampVolt	0x2403	0x2404	Sets the rising slew rate for voltage when in voltage regulation state
RiseRampPwr	0x2405	0x2406	Sets the rising slew rate for power when in power regulation state
RiseRampRes	0x2407	0x2408	Sets the rising slew rate for resistance when in resistance regulation state
FallRampCurr	0x2409	0x240A	Sets the falling slew rate for current when in current regulation state
FallRampVolt	0x240B	0x240C	Sets the falling slew rate for voltage when in voltage regulation state
FallRampPwr	0x240D	0x240E	Sets the falling slew rate for power when in power regulation
FallRampRes	0x240F	0x2410	Sets the falling slew rate for resistance when in resistance regulation state
Control Commands
PowerRange	0x2501	0x2502	Enables extended power range
ControlMode	0x2503	0x2504	Sets the control mode
Function Generator Commands
FuncType	0x2601	0x2602	Sets the desired function for the integrated function generator
FuncSinAmpl	0x2603	0x2604	Sets the amplitude for the sinusoid function
FuncSinOff	0x2605	0x2606	Sets the DC offset from zero for the sinusoid function’s midline
FuncSinPrd	0x2607	0x2608	Sets the period for the sinusoid function
FuncSquLoLevel	0x2609	0x260A	Sets the low level amplitude for the square function
FuncSquHiLevel	0x260B	0x260C	Sets the high level amplitude for the square function
FuncSquLoPrd	0x260D	0x260E	Sets the period that the square function remains at the low level amplitude
FuncSquHiPrd	0x260F	0x2610	Sets the period that the square function remains at the high level amplitude
FuncStepLoLevel	0x2611	0x2612	Sets the low level amplitude for the step function
FuncStepHiLevel	0x2613	0x2614	Sets the high level amplitude for the step function
FuncRampLoLevel	0x2615	0x2616	Sets the low level amplitude for the ramp function
FuncRampHiLevel	0x2617	0x2618	Sets the high level amplitude for the ramp function
FuncRampRisePrd	0x2619	0x261A	Sets the period for the ramp function to transition from low to high level amplitude
FuncRampFallPrd	0x261B	0x261C	Sets the period for the ramp function to transition from high to low level amplitude
Configuration Commands
FactoryRestore	0x2701	N/A	Restores the factory EEPROM data
Lock	0x2703	0x2702	Locks and unlocks the product from configuration and set-point changes
SenseMode	0x2706	0x2707	Configures the sense location and automated compensation values
SetSource	0x270A	0x270B	Sets the setpoint source

12.7. Manufacturer Specific Process Data Objects

12.7.1. Operation Commands

12.7.2. StatusRegQ

This command queries the Status Register. This read-only register holds the live (unlatched) operation status of the MagnaLOAD electronic load. Issuing a query does not clear the register. The register location and definitions are subject to change after any firmware release to accommodate new features. The Questionable Register is a subset of the status register and does not change between firmware updates. The present bit assignments are shown in the table below.

Access

RO

Data Format

32-bit Integer

Status Register

Bit	Name	Description
0	standby	output is in standby
1	live	output is active
2	nonhalt1	available
3	nonhalt2	available
4	overCurrTrip	over current trip
5	overVoltTrip	over voltage trip
6	overPwrTrip	over power trip
7	remoteSenseLoss	remote sense voltage outside of acceptable bounds
8	underVoltTrip	under voltage trip
9	shutdown	target is creating a shutdown condition
10	linPwrLim	power across linear modules exceed ratings
11	resPwrLim	power across resistors exceed ratings
12	bootFailure	one or multiple target did not boot up
13	bootState	one or more targets are waiting to boot
14	phaseCurr	rated phase current exceeded
15	comm	communications are corrupted
16	overCurrProtect	terminal current exceeded product rating
17	overVoltProtect	terminal voltage exceeded product rating
18	tempRLin	linear module exceeded temperature
19	blownFuse	fuse is blown on the auxiliary power supply
20	interlock	interlock open
21	haltUserClear	available
22	maintenance	maintenance
23	tempDMod	diode modules exceeded temperature
24	incompatibleSysConfig	incompatible system configuration
25	stackOverflow	exceeded firmware stack
26	lineFault	line fault analog/digital inputs
27	tempRMod	resistor module exceeded temperature
28	belowRatedMinVolt	below minimum voltage rating(28)
29	outOfRegulation	out of regulation, unexpected currents measured
30	targetUpgrade	mainctrl upgrading other targets
31	haltSelfClear	available
32	phaseLoss	one or more phase missing
33	blownFuseInput	input fuse blown on fuse/emi filter
34	fanLockedRotor	one or more fan’s rotor has locked
35	notUsed29	available
36	tempPwrMod	power processing module temperature fault
37	tempOutputMod	output filter module temperature fault
38	tempOutputCap	output capacitors temperature fault
39	notUsed25	available
40	notUsed26	available
41	notUsed27	available
42	notUsed28	available
43	notUsed1	available
44	notUsed2	available
45	notUsed3	available
46	notUsed4	available
47	notUsed5	available
48	invalidSysRating	invalid system rating
49	notUsed7	available
50	notUsed8	available
51	notUsed9	available
52	notUsed10	available
53	notUsed11	available
54	notUsed12	available
55	notUsed13	available
56	notUsed14	available
57	notUsed15	available
58	notUsed16	available
59	notUsed17	available
60	notUsed18	available
61	notUsed19	available
62	notUsed20	available
63	notUsed21	available

12.7.3. Measurement Commands

12.7.4. MeasCurrQ

This query commands the MagnaLOAD electronic load to measure and return the average current through the DC terminals.

Access

RO

Data Format

32-bit Floating Point Number

12.7.5. MeasVoltQ

This query commands commands the MagnaLOAD electronic load to measure and return the average voltage at the DC terminals. If the remote sense function is used and engaged, this command returns the voltage measured at the sense terminals.

Access

RO

Data Format

32-bit Floating Point Number

12.7.6. Setpoint Commands

12.7.7. SetpointCurr

This command programs the current set-point that the MagnaLOAD electronic load will regulate to when operating in constant current mode.

Access

RW

Data Format

32-bit Floating Point Number

12.7.8. SetpointVolt

This command programs the voltage set-point, in volts, which the MagnaLOAD electronic load will regulate to when operating in constant voltage mode.

Access

RW

Data Format

32-bit Floating Point Number

12.8. Manufacturer Specific Service Data Objects

12.8.1. Operation Commands

12.8.1.1. StatusQuesQ

This command queries and returns the values of the Questionable Register. This read-only register holds the live (unlatched) questionable statuses of the MagnaLOAD electronic load. Issuing this query does not clear the register. The bit configuration of the Questionable Register is shown in the table below.

Index

0x200B

Access

RO

Data Format

32-bit Integer

Questionable Register

Bit	Weight	Abbreviation	Description
0	1	OVP	over voltage protection, hard fault
1	2	OCT	over current trip, soft fault
2	4	OVT	over voltage trip, soft fault
3	8	OPT	over power trip, soft fault
4	16	OCP	over current protection, hard fault
5	32	OTP	over temperature protection, hard fault
6	64	RSL	remote sense loss, hard fault
7	128	CC	constant current regulation, regulation status
8	256	CV	constant voltage regulation, regulation status
9	512	CR	constant resistance regulation, regulation status
10	1024	CP	constant power regulation, regulation status
11	2048	SFLT	soft fault, the ord value of all soft faults
12	4096	HFLT	hard fault, the ord value of all hard faults

12.8.1.2. StatusRegQ

This command queries the Status Register. This read-only register holds the live (unlatched) operation status of the MagnaLOAD electronic load. Issuing a query does not clear the register. The register location and definitions are subject to change after any firmware release to accommodate new features. The Questionable Register is a subset of the status register and does not change between firmware updates. The present bit assignments are shown in the table below.

Index

0x200D

Access

RO

Data Format

32-bit Integer

Status Register

Bit	Name	Description
0	standby	output is in standby
1	live	output is active
2	nonhalt1	available
3	nonhalt2	available
4	overCurrTrip	over current trip
5	overVoltTrip	over voltage trip
6	overPwrTrip	over power trip
7	remoteSenseLoss	remote sense voltage outside of acceptable bounds
8	underVoltTrip	under voltage trip
9	shutdown	target is creating a shutdown condition
10	linPwrLim	power across linear modules exceed ratings
11	resPwrLim	power across resistors exceed ratings
12	bootFailure	one or multiple target did not boot up
13	bootState	one or more targets are waiting to boot
14	phaseCurr	rated phase current exceeded
15	comm	communications are corrupted
16	overCurrProtect	terminal current exceeded product rating
17	overVoltProtect	terminal voltage exceeded product rating
18	tempRLin	linear module exceeded temperature
19	blownFuse	fuse is blown on the auxiliary power supply
20	interlock	interlock open
21	haltUserClear	available
22	maintenance	maintenance
23	tempDMod	diode modules exceeded temperature
24	incompatibleSysConfig	incompatible system configuration
25	stackOverflow	exceeded firmware stack
26	lineFault	line fault analog/digital inputs
27	tempRMod	resistor module exceeded temperature
28	belowRatedMinVolt	below minimum voltage rating(28)
29	outOfRegulation	out of regulation, unexpected currents measured
30	targetUpgrade	mainctrl upgrading other targets
31	haltSelfClear	available
32	phaseLoss	one or more phase missing
33	blownFuseInput	input fuse blown on fuse/emi filter
34	fanLockedRotor	one or more fan’s rotor has locked
35	notUsed29	available
36	tempPwrMod	power processing module temperature fault
37	tempOutputMod	output filter module temperature fault
38	tempOutputCap	output capacitors temperature fault
39	notUsed25	available
40	notUsed26	available
41	notUsed27	available
42	notUsed28	available
43	notUsed1	available
44	notUsed2	available
45	notUsed3	available
46	notUsed4	available
47	notUsed5	available
48	invalidSysRating	invalid system rating
49	notUsed7	available
50	notUsed8	available
51	notUsed9	available
52	notUsed10	available
53	notUsed11	available
54	notUsed12	available
55	notUsed13	available
56	notUsed14	available
57	notUsed15	available
58	notUsed16	available
59	notUsed17	available
60	notUsed18	available
61	notUsed19	available
62	notUsed20	available
63	notUsed21	available

12.8.1.3. Input

This command enables or disables the MagnaLOAD electronic load input. The state of a disabled input is a high impedance condition.

Index

0x2011

Access

RW

Data Format

Boolean

12.8.2. Measurement Commands

12.8.2.1. MeasCurrQ

This query commands the MagnaLOAD electronic load to measure and return the average current through the DC terminals.

Index

0x2101

Access

RO

Data Format

32-bit Floating Point Number

12.8.2.2. MeasVoltQ

This query commands commands the MagnaLOAD electronic load to measure and return the average voltage at the DC terminals. If the remote sense function is used and engaged, this command returns the voltage measured at the sense terminals.

Index

0x2102

Access

RO

Data Format

32-bit Floating Point Number

12.8.2.3. MeasPwrQ

This query commands commands the MagnaLOAD electronic load to measure and return the average power at the DC terminals.

Index

0x2103

Access

RO

Data Format

32-bit Floating Point Number

12.8.2.4. MeasResQ

This query commands commands the MagnaLOAD electronic load to measure and return the average power at the DC terminals.

Index

0x2104

Access

RO

Data Format

32-bit Floating Point Number

12.8.3. Setpoint Commands

12.8.3.1. SetpointCurr

This command programs the current set-point that the MagnaLOAD electronic load will regulate to when operating in constant current mode.

Index

0x2201

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2202

Access

RO

Data Format

32-bit Floating Point Number

12.8.3.2. SetpointVolt

This command programs the voltage set-point, in volts, which the MagnaLOAD electronic load will regulate to when operating in constant voltage mode.

Index

0x2203

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2204

Access

RO

Data Format

32-bit Floating Point Number

12.8.3.3. SetpointPwr

This command programs the power set-point, in watts, which the MagnaLOAD electronic load will regulate to when operating in constant power mode.

Index

0x2205

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2206

Access

RO

Data Format

32-bit Floating Point Number

12.8.3.4. SetpointRes

This command programs the resistance set-point, in ohms, which the MagnaLOAD electronic load will regulate to when operating in constant resistance mode.

Index

0x2207

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2208

Access

RO

Data Format

32-bit Floating Point Number

12.8.4. Trip Commands

12.8.4.1. OverTripCurr

This command programs the over current trip (OCT) set-point. If the input current exceeds the over current trip set-point for multiple samples, the input is disconnected and an OCT fault is indicated.

Index

0x2301

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2302

Access

RO

Data Format

32-bit Floating Point Number

12.8.4.2. OverTripVolt

This command programs the over voltage trip (OVT) set-point. If the input voltage exceeds the over voltage trip set-point for multiple samples, the input is disconnected and an OVT fault is indicated.

Index

0x2303

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2304

Access

RO

Data Format

32-bit Floating Point Number

12.8.4.3. OverTripPwr

This command programs the over power trip (OPT) set-point. If the input power exceeds the over power trip set-point for multiple sample, the input is disconnected and an OPT fault is indicated.

Index

0x2305

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2306

Access

RO

Data Format

32-bit Floating Point Number

12.8.4.4. UnderTripVolt

This command programs the under voltage trip (UVT) set-point. If the input voltage falls below the under voltage trip set-point for multiple samples, the input is disconnected and an UVT fault is indicated.

Index

0x2307

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2308

Access

RO

Data Format

32-bit Floating Point Number

12.8.5. Slew Commands

12.8.5.1. RiseRampCurr

This command sets the current slew rate for increasing current transitions while in constant current regulation. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x2401

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2402

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.2. RiseRampVolt

This command sets the voltage slew rate for increasing voltage transitions while in constant voltage regulation. The units for voltage slew rate are volts per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x2403

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2404

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.3. RiseRampPwr

This command sets the power slew rate for increasing power transitions while in constant power regulation. The units for power slew rate are watts per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x2405

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2406

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.4. RiseRampRes

This command sets the resistance slew rate for increasing resistance transitions while in constant resistance regulation. The units for resistance slew rate are ohms per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x2407

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2408

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.5. FallRampCurr

This command sets the current slew rate for decreasing current transitions while in constant current regulation. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x2409

Access

RW

Data Format

32-bit Floating Point Number

Index

0x240A

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.6. FallRampVolt

This command sets the voltage slew rate for decreasing voltage transitions while in constant voltage regulation. The units for voltage slew rate are volts per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x240B

Access

RW

Data Format

32-bit Floating Point Number

Index

0x240C

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.7. FallRampPwr

This command sets the power slew rate for decreasing power transitions while in constant power regulation. The units for power slew rate are watts per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x240D

Access

RW

Data Format

32-bit Floating Point Number

Index

0x240E

Access

RO

Data Format

32-bit Floating Point Number

12.8.5.8. FallRampRes

This command sets the resistance slew rate for decreasing resistance transitions while in constant resistance regulation. The units for resistance slew rate are ohms per millisecond. MAXimum sets the slew to the fastest possible rate. MINimum sets the slew to the slowest rate. Slew rates less than the minimum value are set to MINimum. Slew rate settings less than the minimum value are set to MINimum. Slew rate settings greater than the maximum value are set to MAXimum.

Index

0x240F

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2410

Access

RO

Data Format

32-bit Floating Point Number

12.8.6. Control Commands

12.8.6.1. PowerRange

This command activates a programmable series resistance and is available only in ARx and WRx models. When enabled, power dissipation is shared across series resistors and linear devices allowing the product to reach higher power levels.

Index

0x2501

Access

RW

Data Format

Boolean

Index

0x2502

Access

RO

Data Format

Boolean

12.8.6.2. ControlMode

This command configures the MagnaLOAD electronic load’s control mode. Control Modes provides more information about the various options.

Index

0x2503

Access

RW

Data Format

16-bit Integer

Index

0x2504

Access

RO

Data Format

16-bit Integer

12.8.7. Function Generator Commands

12.8.7.1. FuncType

This command selects the desired function for the integrated function generator, which is active when the product’s set point source is set to function generator.

Index

0x2601

Access

RW

Data Format

16-bit Integer

Index

0x2602

Access

RO

Data Format

16-bit Integer

12.8.7.2. FuncSinAmpl

This command sets the amplitude (Adc) for the sinusoid function when the set point source is set to 1 (function generator) and the function type is set to 0 (sinusoid).

Index

0x2603

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2604

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.3. FuncSinOff

This command sets the DC offset from zero (Adc) for the sinusoid function midline when the set point source is set to 1 (function generator) and the function type is set to 0 (sinusoid).

Index

0x2605

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2606

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.4. FuncSinPrd

This command sets the period (milliseconds) for the sinusoid function when the set point source is set to 1 (function generator) and the function type is set to 0 (sinusoid). The sinusoid’s period is the length of one full cycle.

Index

0x2607

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2608

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.5. FuncSquLoLevel

This command sets the low level amplitude for the square function when the set point source is set to 1 (function generator) and the function type is set to 1 (square).

Index

0x2609

Access

RW

Data Format

32-bit Floating Point Number

Index

0x260A

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.6. FuncSquHiLevel

This command sets the high level amplitude for the square function when the set point source is set to 1 (function generator) and the function type is set to 1 (square).

Index

0x260B

Access

RW

Data Format

32-bit Floating Point Number

Index

0x260C

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.7. FuncSquLoPrd

This command sets the period/duration (milliseconds) that the square function remains at the low level amplituide when the set point source is set to 1 (function generator) and the function type is set to 1 (square).

Index

0x260D

Access

RW

Data Format

32-bit Floating Point Number

Index

0x260E

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.8. FuncSquHiPrd

This command sets the period/duration (milliseconds) that the square function remains at the low level amplituide when the set point source is set to 1 (function generator) and the function type is set to 1 (square).

Index

0x260F

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2610

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.9. FuncStepLoLevel

This command sets the low level amplitude for the step function when the set point source is set to 1 (function generator) and the function type is set to 2 (step).

Index

0x2611

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2612

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.10. FuncStepHiLevel

This command sets the high level amplitude for the step function when the set point source is set to 1 (function generator) and the function type is set to 2 (step).

Index

0x2613

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2614

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.11. FuncRampLoLevel

This command sets the low level amplitude for the ramp function when the set point source is set to 1 (function generator) and the function type is set to 3 (ramp).

Index

0x2615

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2616

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.12. FuncRampHiLevel

This command sets the high level amplitude for the ramp function when the set point source is set to 1 (function generator) and the function type is set to 3 (ramp).

Index

0x2617

Access

RW

Data Format

32-bit Floating Point Number

Index

0x2618

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.13. FuncRampRisePrd

This command sets the period/duration (milliseconds) for the ramp function to transition from the low level amplitude to the high level amplitude when the set point source is set to 1 (function generator) and the function type is set to 3 (ramp).

Index

0x2619

Access

RW

Data Format

32-bit Floating Point Number

Index

0x261A

Access

RO

Data Format

32-bit Floating Point Number

12.8.7.14. FuncRampFallPrd

This command sets the period/duration (milliseconds) for the ramp function to transition from the high level amplitude to the low level amplitude when the set point source is set to 1 (function generator) and the function type is set to 3 (ramp).

Index

0x261B

Access

RW

Data Format

32-bit Floating Point Number

Index

0x261C

Access

RO

Data Format

32-bit Floating Point Number

12.8.8. Configuration Commands

12.8.8.1. FactoryRestore

This command performs a factory restore to default EPROM values. Both Soft Restore and Hard Restore are available through command parameters.

Index

0x2701

Access

RW

Data Format

16-bit Integer

12.8.8.2. Lock

This command configures the MagnaLOAD electronic load’s lock state. While locked, the stop button is the only functional button on the front panel. See Lock for more details on how lock works and how behaves relative to other locking inputs (front panel and digital input).

Index

0x2703

Access

RW

Data Format

Boolean

Index

0x2702

Access

RO

Data Format

Boolean

12.8.8.3. SenseMode

This command configures where the MagnaLOAD electronic load senses voltage. The sense location also effects how power and resistance are calculated. Local sensing monitors the directly across the output terminals. Remote sensing, as described in Remote Sense Connection, measures across the terminal JS2. This external connection can be used to improve regulation at the point of load, as is needed for example, in compensating voltage drops caused by wire resistance.

Index

0x2706

Access

RW

Data Format

16-bit Integer

Index

0x2707

Access

RO

Data Format

16-bit Integer

12.8.8.4. SetSource

The command selects and routes different set points sources to the digital controller. Operation of this feature is described in Set Point Source. By default, the source is set to local (value 0), where set points originating from the front panel or communication interfaces are routed to the ALx Series digital control. When the source is set to function generator (value 1), set points are generated internally, by a periodic function generator block. When external analog input (value 3) is set, the voltage(s) applied to the rear connector are converted into set points.

Index

0x270A

Access

RW

Data Format

16-bit Integer

Index

0x270B

Access

RO

Data Format

16-bit Integer