s7-1200 acting wierd - timer issue

Hi!

I have a strange problem I can't come up with a solution to.

I have a TONR in my program set at 7 minutes. When the timer reaches 7 minutes it will reset a M-bit. This M-bit is set in a diffrent place in the program. However, when my timer reaches 7 minutes it doesn't get activated, I have checked online and the timer has reached its time but it is still blue (not green as in activated). In what situation can my timer reach its time and not get activated? It has happend on two diffrent TONR in my program (identical programmed)

/Tim

Think that this has something to do with the scan sequence of the networks in your program.

How can the scan time influence the TONR not being activated?

Not scan time, scan sequence.
Make sure the routine the timer is in gets processed.
Jumping over, or not processing timers can have weird consequences.

I have no JMP instructions, I suppose that if I have many OBs they just scan in sequence. I have no interupt or anything :/

change your m bit to a different spare one to prove the timer is working correctly. It is a issue with your set/reset

If you go online and watch the timer, do you see it counting regularly all the way up to the 7 minutes?

If you do a latched Set of the done bit, does the latched bit occur?

I have also made the mistake of getting my order wrong and resetting the timer in my scan sequence before I've checked the done bit - so I basically ripped the rug out from under myself. Made that mistake WAY too many times...

nwboson said:

If you go online and watch the timer, do you see it counting regularly all the way up to the 7 minutes?

If you do a latched Set of the done bit, does the latched bit occur?

I have also made the mistake of getting my order wrong and resetting the timer in my scan sequence before I've checked the done bit - so I basically ripped the rug out from under myself. Made that mistake WAY too many times...

Click to expand...

I haven't seen it counting, but when the problem occure the ET is 7 minutes and the timer is still Green. I will post a screenshot when I get back to the office.