Rockwell Automation 2080-LC20-20QBBR Micro820 20-point Programmable Controllers User Manual User Manual
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Rockwell Automation Publication 2080-UM005A-EN-E - December 2013
147
Modbus Mapping for Micro800 Appendix E
6.
The Parameter window opens. Resize it to view the parameters. From this
window, you can view and set data values of Parameters.
7.
From the Parameter window, change the following Parameters to set the
communications for Modbus RTU so that the PowerFlex 4M Drive will
communicate with Micro830/850 via Modbus RTU communication.
8.
Disconnect the Communications and save your project.
9.
Turn off the power to the drive until the PowerFlex 4M display blanks out
completely, then restore power to the PowerFlex 4M.
The drive is now ready to be controlled by Modbus RTU communication
commands initiated from the Micro830/850 controller.
Modbus devices can be 0-based (registers are numbered starting at 0), or 1-based
(registers are numbered starting at 1). When PowerFlex 4-Class drives are used
with Micro800 family controllers, the register addresses listed in the PowerFlex
User Manuals need to be offset by n+1.
For example, the Logic Command word is located at address 8192, but your
Micro800 program needs to use 8193 (8192+1) to access it.
Modbus Address (n+1 value shown)
8193
Logic Command word (Stop, Start, Jog, etc.)
Parameter
Description
Setting
C302
Comm. Data Rate (Baud Rate) 4 = 19200 bps
4
C303
Communication Node Address (address range is 1…127)
2
C304
Comm. Loss Action ( Action taken when loss communication) 0 =
Fault with coast stop
0
C305
Comm. Loss Time (Time remain in communication before taking
action set in C304) 5 sec ( Max. 60)
5
C306
Comm. Format (Data/Parity/Stop) RTU:8 Data Bit, Parity None, 1
Stop bit
0
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