Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Channels 13-91
Configuring a Channel for Modbus RTU Master
To configure a channel for Modbus RTU master, first place the processor into
program mode and do the following using your programming software:
IMPORTANT
Modbus protocol may not be consistently implemented in
the field. The Modbus specification calls for the addressing
range to start at 1; however, some devices start addressing
at 0.
The Modbus Data Address in the Message Setup Screen
may need to be incremented by one to properly access a
Modbus slave’s memory, depending on that slave’s
implementation of memory addressing.
To bring up the Channel Configuration
interface, double-click on the Channel
Configuration icon.

Allen-Bradley SLC 500 Series Specifications

General

Programming Software	RSLogix 500
Series	SLC 500
Category	Controller
Manufacturer	Allen-Bradley (Rockwell Automation)
I/O Capacity	Up to 4096 I/O points
Communication Ports	DH-485
Programming Languages	Ladder Logic
Operating Temperature	0 to 60 °C (32 to 140 °F)
Relative Humidity	5% to 95% (non-condensing)
Memory	4K to 64K words (depending on the processor)
Power Supply	AC or DC (depending on the module)