Publication 1747-RM001G-EN-P - November 2008
12-38 SLC Communication Instructions
Once the EN bit is set, it remains set until the entire MSG process is complete
and either the DN, ER, or TO bit is set. The MSG Timeout period begins
timing when the EN bit is set. If the timeout period expires before the MSG
instruction completes it function, the ER bit is set and an error code (37H) is
placed in the MSG block to inform you of the timeout error.
If you choose to set the CO bit, your MSG instruction will take up permanent
residence in one of the four active MSG buffers. The MSG instruction
continues to re-transmit its data each time the DN or ER bit is set. If this were
a MSG Write instruction, your source data would be updated each MSG cycle.
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