I'm looking at a ladder code from a PLC5/20 and there is an instruction I don't understand:
It's a FAL block that goes like this:
Control-------R6:0
Lenght--------20
Position------0
Mode----------ALL
Dest----------#N22:80
Expression----(- 1) OR #N22:80
What does it mean to make an OR instruction with -1???
Thanks.
It's a FAL block that goes like this:
Control-------R6:0
Lenght--------20
Position------0
Mode----------ALL
Dest----------#N22:80
Expression----(- 1) OR #N22:80
What does it mean to make an OR instruction with -1???
Thanks.