Summary of programming considerations, Summary of programming considerations -22 – Rockwell Automation 1747-BSN Backup Scanner Module User Manual
Page 164
Publication 1747-UM010B-EN-P - September 2003
9-22 Programming Techniques
Summary of Programming
Considerations
When developing a program for the SLC 500 backup system, you must
always consider the following:
•
non-synchronous I/O scans
•
execution times of block transfer instructions
•
time for transfer of data from the primary to the secondary
processor
•
the need to reduce the quantity of data to be transferred, and
gathering all related data into a single block
•
synchronization of discrete I/O data with regard to program
scans even though remote I/O scans are performed
asynchronously
•
the need to disable message instructions in the secondary
processor using the primary/secondary bit
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