ONLINE Changing ladder logic for a redundant PLC5 - PLCS.net

ckchew666 · June 25th, 2004, 05:02 AM

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

grs · June 25th, 2004, 07:50 AM

Is this using the BCM modules or the CHBM?

ckchew666 · June 25th, 2004, 07:54 PM

It's using BEM & BCM modules. Any differences? Thanks.

ckchew666 · June 26th, 2004, 09:09 AM

Anyone care to response? Thx.

June 25th, 2004, 05:02 AM	#1
ckchew666 Member Join Date: Aug 2003 Location: a Posts: 580	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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June 25th, 2004, 07:50 AM	#2
grs Member Join Date: Aug 2003 Posts: 201	Is this using the BCM modules or the CHBM?

June 25th, 2004, 07:54 PM	#3
ckchew666 Member Join Date: Aug 2003 Location: a Posts: 580	It's using BEM & BCM modules. Any differences? Thanks.

June 26th, 2004, 09:09 AM	#4
ckchew666 Member Join Date: Aug 2003 Location: a Posts: 580	Anyone care to response? Thx.

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