OTL Latch problem

[Boss2553 0]

I have a program here that has Latch (OTL) with no (OTU) it works ok. There is more than one in this program. I have RsLogix500 software and a Microligix1500 PLC. Book1.xls

[ratcliffe_ic 2]

You probably have something that clears the full word e.g clr B3:1 ( or maybe a MOV 0 or a FLL command) somewhere in the program

[Boss2553 0]

Thank you, that was it a CLR. Learn somenthing new every day.

[paulengr 44]

Next time if you see one of these, use the cross reference function instead of just a simple search. On a PLC-5/SLC series processor, it will list all references even those that are word/block references, not just bits. The only thing it won't pick up on is indirect and indexed addressing.

[slcman 9]

When you double clic on B3 file, and then clic on USAGE button, you see all use bit and word. X represent witch bit is used and W in FW column mean full word used.