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|June 25th, 2004, 05:02 AM||#1|
ONLINE Changing ladder logic for a redundant PLC5
I need advise on a redundant PLC 5. I need to modify the ladder logic and add in some new data files for a redundant PLC5/40. The system is critical & cannot afford a shutdown.
I'm planning to change the program on the secondary (backup) PLC5/40 by putting the secondary PLC 5/40 into REM, after the modification is done, I'll switch it back to RUN. Then, I'll switch the PRIMARY PLC5/40 into REM & let the SECONDARY PLC5/40 take control, while I modify the PRIMARY PLC5/40 ladder logic.
After completed, I'll switch the PRIMARY to RUN also and switch the SECONDARY PLC5/40 to PROGRAM, so that the PRIMARY PLC5/40 will take control.
I've no experience with redundant PLC5 system, am I doing the right thing in order to avoid the machine to shutdown?
Hope someone can give me a word or two. Thanks
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