Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Instructions 12-23
The default Slave Node Address is 1. The range is 0 to 247. Zero is the
Modbus broadcast address and is only valid for Modbus write
commands (5, 6, 15 and 16).
• Modbus Address
This is the translated Modbus address from the MB Data Address.
Configure a Modbus Message
This section describes how to configure a local message using the Modbus
communication commands. Since configuration options are dependent on
which channel is selected, the programming software has been designed to
only show the options available for the selected channel.
Before configuring the MSG instruction, open the Channel Configuration
screen and set the Driver to Modbus RTU Master. For more information on
Channel Configuration, see Configuring a Channel for Modbus RTU Master
on page 13-91.
Figure 12.1 Message Setup Screen
Rung 0 shows a standard RSLogix 500 message (MSG) instruction preceded
by conditional logic.
1. Double-click Setup Screen to access the message setup screen.
2. The RSLogix 500 Message Setup Screen appears. This screen is used to
setup or monitor message parameters for “This Controller”, “Target
Device”, and “Control Bits”. Descriptions of each of these sections
follow.
TIP
To initiate a broadcast message on a Modbus network, set
the slave node address to 0. Do not initiate more than one
Modbus broadcast message at a time. When sequentially
triggering multiple Modbus broadcast messages, insert at
least 10 msec. delay in between each message.