SHL shift register S7-1200

mulderm · Dec 28, 2016

Hello,

I want to use the shift register SHL for siemens S7-1200 cpu.
I expect when I trigger the EN-input that the IN- value (1) by each
triggerpuls moved forward to left in the OUT word.
But by every pulse the output will be 2!
I expected by each puls value 2,4,8 etc. etc.
So it's a bit shift register.
What is wrong?

greetings mulderm

boneless · Dec 28, 2016

You are not changing tag_4. So every cycle, you give the same number (1).

Try using the same tag on both sides, so use tag_4 on both IN and OUT.

You might also want to use a edge detection, right now the block will be active every cycle that you clock is high.

mulderm · Dec 28, 2016

Boneless,
You are wonderful.
When using the tag boths IN and OUT it was still not working.
But when place also the edge detection, it is working!
Very good.
Can you explain what is happening about this network?
So I can understanding the SHL register.

greetings mulderm.

boneless · Dec 28, 2016

I am not sure why you need the one-shot, I assumed it was just "good practice" but I just tested and can confirm what you noticed.

Select the SHL and hit F1, that will explain a lot!

shooter · Dec 28, 2016

The IN is shifted N times left, when EN is TRUE
when you use same tag it will multiply by 2 (every 0.5 seconds)

shooter · Dec 28, 2016

SHL shift register S7-1200

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