Allen-Bradley ControlLogix - Chapter 5: Logix5550 Controller to PLC-5 C Unscheduled Messaging

1756-6.5.3 - December 1999
Chapter 5
Logix5550 Controller to PLC-5C:
Unscheduled Messaging
About the Example Application
This example application sends an unscheduled message from a Logix5550
processor to a PLC-5C processor. The Logix5550 processor is in slot 0 of
the ControlLogix chassis and the1756-CNB module (configured as node 1)
is in slot 1. The PLC-5C is configured as ControlNet node 11. A Counter
that increments continuously provides the test data for the message.
Set Up the Example Application
Change your system configuration to that shown below:
• Verify that the Logix5550 processor and the 1756-CNB module are in
slots 0 and 1 as shown.
• Verify that the node address for the 1756-CNB module is 1 and the node
address for the PLC-5C processor is 11 as shown.
What you will do See page
Set Up the Example Application 5-1
Create the Example Application 5-2
Create the Controller Tags for the Write Message Program 5-3
Create the Write Message Ladder Program 5-4
Download the Write Message Program 5-6
Test the Example Application 5-7
ControlNet Network
Logix5550
1756-CNB
(Node 1)
PLC-5C
ControlLogix
Chassis
1771 I/O
Chassis
PC with
1784-KTCX15
Interface
Message
Slot 0 1
(Node 11)
Processor