Rockwell Automation Publication 2080-UM005E-EN-E - March 2018 13
About Your Controller Chapter 2
Using Run Mode
Configuration Change
(RMCC)
Run Mode Configuration Change (RMCC) is a productivity enhancement
feature introduced in Release 9 for Micro820/Micro830/Micro850 controllers.
It allows users to reuse an identical program with multiple controllers simply by
changing the address configuration of a controller within the program during run
mode. Micro820/Micro830/Micro850 controller firmware revision 9.xxx or
higher is required to use this feature.
RMCC can be used to change the address configuration of the controller during
run mode when the communication protocol is set to Modbus RTU for serial
ports or EtherNet/IP for the Ethernet port. RMCC uses a CIP Generic message
which can only be sent from within a controller program and not from an
external device to the controller.
CIP Generic Message Instruction for Run Mode Configuration Change
Run Mode Configuration Change (RMCC) can only be performed by the
controller that is sending the message. To do that, you need to configure the CIP
Generic message as a loop-back message by setting the path to “0,0”.
Configure CIP Generic Message as a Loop-back Message
For Micro820 controllers, the address configuration change is not permanent and
will be lost when the controller is power cycled (for firmware revision 9 or
earlier). If you want the address to be changed immediately after a power cycle,
you must execute this CIP Generic message after every power up. This can be
done by doing the following:
• Use the system variable __SYSVA_POWER_UP_BIT.
• Set the Retained flag for the variable containing the new address.
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