Shift in time train of pulses

William B.

@Jens..
I am giving my alternative a try. If this is not what is required then we (forum) will have to see how to get a syncronise solution or at least get the sampling rate high enough.

Think about the problem as if it is a music recording.. you need to up the sampling rate and write into a bit buffer. The issue is that the normal commands does not allow such huge bit shifting. You will have to employ a rotating bit array buffer.

But let's try something else first.

@drgry..
You do not need reproduce the pulses in time space.

Have the pulsing sensor trigger a counter (HSC).
The counter can run continuously.
Every pulse represents a distance.

--non industrial example--
Think of the counter as if a meter-wheel.
Every click of the wheel is a meter.
On the meter-wheel is a counter.
When the meter-wheel reads 100m and you need to walk 3m
you will walk until the meter-wheel says 103m.

--back to our problem--
When the product is at the "registration" sensor
you can record the product position by looking the (HSC) counter value.

The action that needs to take place is a set fixed distance from the registration sensor.
Add the distance - in counter units - to the count value that was recorded.
Write the new value in an array of DINT values.

The action takes place when the counter (HSC) reaches the value you calculated earlier.
Now you decide how long the action takes place by timer
or use the counter's distance.

Many detail points are not mentioned.
Especially the handling of the array.
But the technique works very well.

Will this work for you?

Greetngs.
w

drgry

Thank you for your support. But we are not looking at the problem the same way. Maybe I need to explain some more:

1. I do not have encoder or any other signal for HSC. I am only measuring time.HSC is used for signals much faster than OB1 cycle time, that is for signals which cannot be measured/counted in one OB1 cycle. Example of such signal is, as you put it correctly, encoder. But I do not have one and do not need one.

2. Signals are not so fast. My OB1 cycle is 5 ms. Signals I am working with are much slower. Signal from "pusher" is 1 second in period and lasts at least 50 ms. Product is passing past sensor for at least 400 ms.

3. I am not synchronizing my machine on any high speed signal. My leading signal is pusher (1s period/50ms duration).

4. What I need is to recreate this signal after 200 ms later to perform some other functions on machine (moving some arm).

5. When product passes the sensor (and it does so in around 400ms) after 500ms I need to apply some glue for exactly the length of the product (that is time that takes the product to pass past sensor). For this I need to shift pulses from sensor for 500ms and then start glue applicator.

In all this I do not have and essentially do not need encoder. Process is "slow" and can be synchronized by sensors on machine.

I just need to move these pulses in time for some delay. That is all.

drgry

@Jens_app

This is the place where I stopped. S7-1200 do not haveTIME_TCK function and I can not find any other function like that (maybe I am not looking where I should). All I can find is TON,TOF and TP nothing else.

As I wrote in my first post:

To all this is related, as a problem to me, measuring time duration of impulses.

I do not know how to do this on S7-1200.