Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM - Manual (Page 219)

Publication AG-UM008C-EN-P - February 2005
Configuring MicroLogix 1000 Controllers 6-15
Polled Report-by-Exception
A slave station can gather information from the I/O points it is
responsible for and can send any anomalous readings to the master
station. To do this, write logic in the slave station’s controller to
monitor certain conditions and send the data in an MSG instruction to
the master station. Figure 6.5 is an example MSG instruction and
control block that a MicroLogix 1000 controller slave station can send
to a PLC-5 master station. Figure 6.7 is an example MSG instruction
and control block that a MicroLogix 1000 controller slave station can
send to a MicroLogix 1200 and 1500, SLC 500 or Logix master station.
For sample messaging ladder logic when using a MicroLogix 1000 as a
slave, see page E-14.
Processor-to-Processor
A processor-to-processor 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.
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