Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001B-EN-P - April 2007
360 Communications Instructions
Message Servicing Selection
Use this check box to enhance communication capability. If this is
checked and the Communication Servicing Selection check box is not
checked the MSG functionality throughput (and scan time) will increase.
• When this check box is checked, the controller services one
outgoing channel 0 or channel 1 MSG instruction at the next Service
Communications (SVC) instruction, I/O Refresh (REF) instruction, or
when it performs Communications Servicing. When this check box
is clear (unchecked), the controller services all outgoing channel 0
or channel 1 MSG instructions at the next Service Communications
(SVC) instruction, I/O Refresh (REF) instruction, or when it performs
Communications Servicing.
• The Message Servicing Selection (Channel 0 or channel 1) bit is
applied by the controller when the Communications Servicing
Selection (Channel 0 or channel 1) bit is clear (unchecked).
MSG Instruction Ladder
Logic
Enabling the MSG Instruction for Continuous Operation
The message instruction is enabled during the initial processor program
scan and each time the message completes. For example, when the DN or
ER bit is set.
0000
EN
DN
ER
MSG
Read/Write Message
MSG File MG11:0
Setup Screen
MSG
0001
MG11:0
DN
MG11:0
ER
U
MG11:0
EN
0002
END
Message Done Bit
Message Error Bit
Message Enable Bit
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English