6RL SERIES OPERATION MANUAL
SECTION 7: REMOTE PROGRAMMING
Entire Contents Copyright
2018 by Adaptive Power Systems, Inc. (APS) • All Rights Reserved • No reproduction without written authorization from APS.
6RL Series Regenerative DC Load Operation Manual
Page 133 of 204
7.11.5
Register 505 (Device status)
This is an important register as it represents the device condition in one 32-bit value
(ModBus). Some bits are grouped and have to be interpreted as such. According to the
register list, bits 0-4 of registers 505 are a group that represents the so-called control
location. By reading this register you can furthermore detect if the unit is already in remote
control to see if command “Remote mode = on” was executed by the unit.
With SCPI, some but not all of these 32 bits of this register are represented in the status
registers "Questionable" and "Operation". See SCPI section under registers.
When running master-slave
During master-slave operation (where featured), the status register uses bit 29 ("MSS") to
indicate the so-called master-slave safety mode, which is activated every time the master
detects any problem in the communication with the slave(s), which can occur due to a
connection failure or heavy electrical interferences. The master unit will then set this bit and
switch off all DC Inputs/input of the slaves being still online. Offline slaves will put
themselves into a similar state and switch off DC.
After removal of the problem cause, the MS system has to be re-initialized, which also clears
the bit.
7.11.6
Registers 650 - 662 (Master-slave configuration)
This block of registers is used to configure the master-slave operation mode (short: MS) the
same as you can do it in the setup MENU of your unit. Refer to the unit's operating guide
about how the MS works and what do to in preparation of its remote control. For remote
control of a MS system, it is expected to be fully wired. Before MS operation, slave units can
be configured remotely, but during MS operation they can only be monitored, if required. It
is recommend to only control the master unit. Configuration and activation of MS operation
can also be done manually and remote control can be taken over later after the master has
initialized the system.
With the MS system not being set up yet, these registers have to be used in a certain order
on any unit:
1.
Switch to remote control with register 402.
2.
Activate MS operation mode with register 653.
3.
Select with register 650 whether the unit you are configuring will be Master or
Slave. Further steps, only to be performed on the master unit:
4.
Initialize the MS system with register 654.
5.
(with electronic loads only and also only required when running two-quadrants
operation) Set the unit to be Share bus slave (else it would be master) with register
652.
6.
Optional: check with register 655, whether the initialization has been successful.
7.
Optional: Query the number of initialized units with register 662 --> in case the
number does not match the units you want to use in the MS system, check the
settings of all units and the cabling and repeat the initialization.
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