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Communicating with a
SLC5/05 (1747-L552)
Controller and ControlNet
Scanner (1747-SCNR),
Unscheduled Messaging
Allen-Bradley HMIs
The Power Energy and Management Systems development team
tested the following example ladder. The scan times for execution of
the ladder are as follows.
Table C.10
Operation
Table reads for Integer and float files
Table writes of Integer and float files
All the communication operations of the ladder are locked out until
the read or write bits are set. This was done so that other operations
performed by the ladder will have minimum overhead from
communications. The following files are of importance when using
the ladder example.
N7 SCNR_FILE
The following items are of importance in file N7:0:
Sample Applications
Scan Time
20 ms
30 ms
Publication 1404-UM001D-EN-E - October 2004
C-33
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