Simatic manager send counter output to register

stayclashy80 · Feb 1, 2021

Hello friends,

So I made a S_CU and its working fine. Problem is it only goes to 999. I want to send the counter output to a register that continuously counts and goes much higher than 999. Also I need to know if the S_CU I made will start over automatically at 1000 and go back to 1 and continuously count or if I need make it count continuously.

Thanks guys

Screen capture logic for wireless IO testing.png

L D[AR2P#0.0] · Feb 1, 2021

Use the IEC counter from the library. It's a 32bit counter.

stayclashy80 · Feb 1, 2021

I changed it to the system counter SFBO but can't seem to address it properly. I'm guessing I need to create a new DB just for this SFBO instruction?

parky · Feb 1, 2021

Or you could just create a one shot off the input and increment a 32 bit variable instead of using a counter

stayclashy80 · Feb 1, 2021

Dang still having issues with this. Can someone post a screen shot of what the logic should look like?

parky · Feb 1, 2021

Some years since I did S7 but if I remember right the one shot bit is like this
Trigger ones hot (M10.0) Add 1 to DB10 double dataword 0
----| |------(#)-------------[INC DB10.DBD0]

As I said some years since I did S7 so my code may be a bit off.
LD will put you right in any form be it a counter or incrementing a double word.

mk42 · Feb 1, 2021

stayclashy80 said:
I changed it to the system counter SFBO but can't seem to address it properly. I'm guessing I need to create a new DB just for this SFBO instruction?

It's SFB0, not SFBO (not sure if that was a type or the source of your issue). But yes, you would need to create an instance DB for it, unless you're calling the code from another FB and can multi-instance it in.

Rob... · Feb 1, 2021

This is what I would use.

Of course you could use memory tags or link to DB.

sigmadelta · Feb 1, 2021

...for a reset to 0, add a GT_I or GE_I comparator to compare #total_counts to a value of 1000, which would MOV 0 to #total_counts:

stayclashy80 · Feb 1, 2021

Ah sweet, thanks Rob. I suck. Something so simple kicking my butt.

sigmadelta · Feb 1, 2021

Here is the SFB0 solution with reset. Note: at the very moment the counter hits 1000, it would reset to zero, so you should decide if you need your preset to be 1000 or 1001.

Simatic manager send counter output to register

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