Rockwell Automation Publication 1420-UM001E-EN-P - March 2016 43
Communication Chapter 4
The destinations of the CPS instructions are in a tag with a user-defined data
type.
The destination tag shows the data in this way.
Modbus Communication
For a complete description of the MODBUS protocol refer to the following
documents that can be downloaded from http://www.modbus.org
:
• Modbus_Application_Protocol_ V1_1a
• Modbus_Messaging_Implementation_Guide_V1_0a
Modbus Functions Supported
Modbus RTU is supported in PowerMonitor 500 units that are ordered with
optional RS-485/RS-232 communication. In addition, Modbus TCP/IP is
supported in units that are ordered with optional Ethernet communication.
Communication parameters in the power monitor must be configured. See the
Unit Configuration
section of this manual.
We recommend that you use Modbus TCP/IP to configure or write to the
PowerMonitor 500 unit and that you use Ethernet/IP to read the
PowerMonitor 500 unit.
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