User Manual, PRIOR to Firmware rev. 3.0 Owner manual

Publication 1404-UM001D-EN-E - October 2004
Sample Applications C-33
Communicating with a
SLC5/05 (1747-L552)
Controller and ControlNet
Scanner (1747-SCNR),
Unscheduled Messaging
The Power Energy and Management Systems development team
tested the following example ladder. The scan times for execution of
the ladder are as follows.
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:
Table C.10
Operation Scan Time
Table reads for Integer and float files 20 ms
Table writes of Integer and float files 30 ms