Omron CPM1 PLC ladder-logic "set/rset" vs "out/not out"

[Grunchy]

Lately my company has been using Omron PLCs which are programmed using ladder logic. We had this frustrating experience where we were using "out/not out" commands (one per relay, per block). The frustrating thing is, to put all these darn conditions in each individual network to control each individual relay. Our whole program uses these commands exclusively and it's a mess! Very tough to figure out how it works.<br>
<br>
I went to program a new subroutine for machine diagnostics, just to cycle each movement and time the motion and report the results. So anyway, I looked through the manual and found out about "set/rset" which lets you turn on and turn off a relay based on computed input conditions, ie, end of stroke. I used these commands very successfully and the diagnostic program was completed and debugged (on site!) in only a day. We could have done the whole program this way but never knew about these commands.<br>
Another command Omron has is "keep", anyone have experience? I haven't used it yet.<br>
<br>
Oyster

 

[alfonso]

Keep is exactly the same, and it works the same way as SET and RESET, the only difference is that you have both commands in one, this mean that two inputs, one to activate and the other to desactivate, if you activate both inputs, the reset input is priority.