Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 255)

Publication AG-UM008C-EN-P - February 2005
Configuring Logix Controllers 7-29
Controller-to-Controller
A controller-to-controller message can be the following 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 an MSG instruction. That is,
an MSG instruction being sent between two Logix slave stations is
configured the same as an MSG instruction between two Logix
controllers connected point-to-point, which is configured the same as
an MSG instruction between a Logix master station and a Logix slave
station. See Figure 7.8 through Figure 7.13 for example MSG control
blocks.
Master Station routes MSG to
Slave Station 2
Modem Modem
MSG from Slave Station 1 to
Slave Station 2
Slave
Station 1
Slave
Station 2
Master
Station
Modem
Station 1 Station 2
MSG
Modem Modem