CNTX instruction issue in SFC

[enky007 0]

Hi, it's my first time posting S:

 

Here's the issue:

When I start a simulation and activate a CNTX instruction with Step.X or P_On nothing happens, it's either stuck at the set value or doesn't behave properly.

Is there a way to decrement a CNTX instruction in SFC with the Step itself?

I know I can use other means but, I was specifically asked to use a CNTX instruction.

 

Type: CJ1M CPU23

Cx-Programmer V.9.5

 

lmk if you guys need more details, thx

Edited 11 Nov 2016 by enky007

[Michael Walsh 268]

I am not sure what you are doing wrong.  Is your simulated PLC in Monitor or Run mode.  It is working fine for me. 

I forced on the count input 3 times in the ladder below and you can see the results:

My instruction is set up to be displayed horizontally, but otherwise the same. 

One other thought:  are you using C5 somewhere else in the code perhaps?

[BITS N BYTES 66]

Are the Program Properties for the Task containing your code set for Operation Start?

[enky007 0]

On 2016-11-11 at 9:40 AM, Michael Walsh said:

I am not sure what you are doing wrong.  Is your simulated PLC in Monitor or Run mode.  It is working fine for me. 

I forced on the count input 3 times in the ladder below and you can see the results:

My instruction is set up to be displayed horizontally, but otherwise the same. 

One other thought:  are you using C5 somewhere else in the code perhaps?

I'm trying to use the ''Step.X'' to activate the counter instruction.

C5 is only used there, I've uploaded a video showing the problem with a simpler SFC program (Link is down)

On 2016-11-12 at 9:46 AM, BITS N BYTES said:

Are the Program Properties for the Task containing your code set for Operation Start?

Yes, it's checked.

 

>> I've uploaded a YouTube video with the issue: https://youtu.be/dV7poubuKAU

 

When I try with TIMX the timer works like it should... Why is the CNTX instruction not counting down?

 

Edited 13 Nov 2016 by enky007

[BobB 58]

Counters only count on a rising edge. If the input does not turn off and on again it will not count.

[enky007 0]

13 hours ago, BobB said:

Counters only count on a rising edge. If the input does not turn off and on again it will not count.

ohh thx

If I put a 1sec ''Pulse'' (P_1s) it does count down.

So I would have to find a way to turn off and on the step or the line, but only once, hmm

 

 

 

 

Edited 14 Nov 2016 by enky007

[enky007 0]

If I understand correctly, here's how I think I solved my problem:

I've put the Counter action to my initial Step with the Qualifier ''S'' which means it's gonna keep the action always active.

So as soon as I start my SFC simulation the counter instruction will remain with a ''off'' (instead of being inactive).

Then to activate the counter, I just have to get on the Step#.X I've input.

The instruction will pass from a ''off'' to a ''on'', resulting in a count down.

 

Here's my simulation on video: https://youtu.be/WJPzQaCrXxE

 

lmk what you guys think?

 

Edited 15 Nov 2016 by enky007