KEEP(11) Instruction

[chad 0]

What the hell is a KEEP instruction it is being used as an output on the rung like a counter or a timer any help is welcome thanks

[TERdON 9]

It's a bistable output (flip-flop) / latching relay (pick whatever you can relate to the closest). It has two inputs - the top one is a SET input, and the bottom one is a RESET input. When the top execution condition is true, it sets the output bit to true, if the bottom is true the output is set to false. If neither is on, the output retains its value from the last PLC scan cycle. Turning on both inputs will turn the output off (the bottom input, the reset, has highest priority). All this is EXTENSIVELY (pages 224 through 228) covered in the instructions reference manual, including several programming examples, for CS1/CJ1 systems (or if you are dealing with older systems it's covered in the relevant programming manual). As you obviously don't have access to it right now, please download it, either from MrPLC or from your local Omron website, where it should be available for free. If you'll be programming Omron PLC's a lot I'd suggest buying it in paper form from Omron. It's fairly cheap and a really handy reference.