The COMMREQ that sends this command may be executed on the first PLC sweep.
If the COMM_REQ status word location specified in words 3 and 4 of the command block is not a valid
%R, %AI or %AQ reference, power flow into the COMM_REQ function block will cause power flow to its
fault (FT) output. Otherwise, the value one (1) is written to the status word when the command succeeds.
When unsuccessful, one of these values is returned:
WAIT-mode COMREQ is not permitted; must use NOWAIT.
Command not supported; the port is either not configured as an SNP
slave or does not support break-free operation.
Sending this command when break-free SNP is already enabled has no effect; however, the COMMREQ
status location will be set to 1, indicating success. Sending this command to a PLC CPU built-in serial
port that does not support break-free SNP will set the fault output of the COMMREQ.
SYSID: IC693CPU311, IC693CPU313, IC693CPU323:
Example Command Block:
Word 1: 00001 (0001) SNP Data Block Length
Word 2: 00000 (0000) NOWAIT Mode
Word 3: 00008 (0008) Status Word Memory Type (%R)
Word 4: 00000 (0000) Status Word Address minus 1 (Register 1)
Word 5: 00000 (0000) Not Used
Word 6: 00000 (0000) Not Used
Word 7: 07005 (1B5D) SNP Command Number: Enable break-free SNP
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