Rockwell Automation Publication 1789-UM002K-EN-P - January 2015 229
Communicate with Devices on a ControlNet Network Appendix B
Send a MSG Instruction
You configure an MSG instruction to a ControlLogix and FlexLogix controller
the same as you do for a SoftLogix controller. All Logix-based controllers follow
the same MSG configuration requirements. Configuring an MSG instruction for
a PLC-5 controller depends on the originating controller.
For MSG instructions originating from the SoftLogix controller to the PLC-5
controller for the ControlNet network, follow these guidelines.
The PLC-5 controller supports logical ASCII addressing. Place the SoftLogix
tag name in double quotes (“).
Type of Logix MSG Instruction Source Destination
PLC-5 Typed Read Any integer element (such as B3:0, T4:0.ACC, C5:0.ACC,
N7:0, and so forth)
SINT, INT, or DINT tag
Any floating point element (such as F8:0, PD10:0.SP, and
so forth)
REAL tag
PLC-5 Typed Write SINT or INT tag Any integer element (such as B3:0, T4:0.ACC, C5:0.ACC,
N7:0, and so forth)
REAL tag Any floating point element (such as F8:0, PD10:0.SP, and
so forth)
PLC-5 Word Range Read Any data type (such as B3:0, T4:0, C5:0, R6:0, N7:0, F8:0,
and so forth)
SINT, INT, DINT, or REAL
PLC-5 Word Range Write SINT, INT, DINT, or REAL Any data type (such as B3:0, T4:0, C5:0, R6:0, N7:0, F8:0,
and so forth)
Type of PLC-5 MSG Instruction Source Destination
PLC-5 Typed Write to SoftLogix Source element N7:10
Destination tag ’array_1’
PLC-5 Typed Read from SoftLogix Source tag ’array_1’
Destination element N7:10
You can also do PLC-5 Typed Read and Writes messages to a Logix controller
without using logical ASCII addressing by creating a PLC-5 compatibility file in
the Logix controller for MSG instructions initiated by a PLC-5 controller.
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