Omron timers....

Nesstar · Oct 21, 2010

Okay here is my problem...

I am using a c200h-cpu 21, and I am trying to get it to calculate cycle times... This is starting to get pretty frustrating. I am use to AB and with my limited omron experience I am unable to get the timers to work for my situation.

What I want is whenever this upload cylinder extends a timer starts counting and as soon as the cylinder extends again it sends the current value to a memory address and the timer restarts...

The problem I am experiencing is that I can not get a present value from these timers... It seems the only value I can get from these timers is a done bit...

I am pretty sure there must be a simple solution but for the life of me I can not figure it out.

Any suggestions would be awesome.

sthompson · Oct 21, 2010

Nesstar said:
Okay here is my problem...

I am using a c200h-cpu 21, and I am trying to get it to calculate cycle times... This is starting to get pretty frustrating. I am use to AB and with my limited omron experience I am unable to get the timers to work for my situation.

What I want is whenever this upload cylinder extends a timer starts counting and as soon as the cylinder extends again it sends the current value to a memory address and the timer restarts...

The problem I am experiencing is that I can not get a present value from these timers... It seems the only value I can get from these timers is a done bit...

I am pretty sure there must be a simple solution but for the life of me I can not figure it out.

Any suggestions would be awesome.

Yes Omron does things differently, for one thing the Timers count down. I would suggest you put the Preset for the Timer into a DM Register. Then use a Subtract (SUB) Instruction to Subtract the Timer Present Value from the Preset DM into the desired DM Register when your event triggers.

Stu....

BITS N BYTES · Oct 21, 2010

Use timer and set to maximum permitted time.
In C200 this is #9999.
Timer starts when input goes OFF.
When input goes ON trigger oneshot rising [DIFU] and subtract timer P[resent] V[alue] from #9999.
Result is Expired Time.

Nesstar · Oct 22, 2010

If I am working in Online edit and do not send the edit... I can watch the logic go true but when i watch the timer value it stays at 0... Or I do not know how to get the Present value out of it.

I do like how your code flows though B&B so i think i may rewrite mine >.<

Thanks again!

Thanks for your help!

Nesstar.

BITS N BYTES · Oct 22, 2010

If you don't send the edit then the instruction will not function, BUT any boolean states will show ON/OFF conditions.

Once a timer instruction is programmed the P[resent] V[alue] of that timer is accessed by simply using T followed by the timer number. In my example the subtract instruction is entered as "SUB #9999 T0 D0". Once entered it will show as TIM0.

Be absolutely sure that the TIM instruction is AFTER the DIFU and SUB rungs, it won't work otherwise.

Note that as the TIM instruction has a 100mSec resolution and the preset is #9999 then max time you can measure is 999.9secs.
If you need higher resolution then use TIMH. This has a resolution of 10mSecs or 99.99secs when set at #9999.

Note from manual when using TIMH.
"If the cycle time is greater than 10 ms, use TC 000 through TC 015.
Description TIMH(15) operates in the same way as TIM except that TIMH measures in units of 0.01 second.
The cycle time affects TIMH(15) accuracy if TC 016 through TC 511 are used. If the cycle time is greater than 10 ms, use TC 000 through TC 015."

Omron timers....

Nesstar

Member

sthompson

Lifetime Supporting Member + Moderator

BITS N BYTES

Lifetime Supporting Member

Nesstar

Member

BITS N BYTES

Lifetime Supporting Member

Similar Topics