Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 62)

Publication AG-UM008C-EN-P - February 2005
2-24 Configuring Enhanced PLC-5 Processors
Processor-to-Processor
A processor-to-processor message can be two types:
•
In a point-to-multipoint configuration, the messaging would be
between slave stations; the master station automatically routes
the message.
•
In a point-to-point configuration, the messaging would be
between the two connected peer devices.
The configuration of the network (point-to-multipoint vs.
point-to-point) and the configuration of the station (master, slave, or
peer) does not affect how you configure a MSG instruction. That is, a
MSG instruction being sent between two PLC-5 slave stations is
configured the same as a MSG instruction between two PLC-5
processors connected point-to-point, which is configured the same as
a MSG instruction between a PLC-5 master station and a PLC-5 slave
station. See Figure 2.5 through Figure 2.8 for example MSG control
blocks.
MSG from Slave
Station 1 to Slave
Station 2
Slave
Station 2
Master
Station
Slave
Station 1
Modem Modem
Modem
Master Station
routes MSG to
Slave Station 2
Modem Modem
Station 1 Station 2
MSG