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efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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Communications Instructions
MSG Instruction Ladder
Logic
0000
Message Done Bit
0001
Message Error Bit
0002
Publication 1763-RM001B-EN-P - April 2007
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).
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.
MG11:0
DN
MG11:0
ER
MSG
MSG
Read/Write Message
EN
MSG File
MG11:0
DN
Setup Screen
ER
Message Enable Bit
MG11:0
U
EN
END
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