Use system clock to simulate pulsed input

Hi Folks,

I have a ladder that includes an inductive sensor used to sense rotation at the idler end of a conveyor belt.

I'm using a Micro 820 and Connected Components Workbench. In order to test and simulate the pulsed input I have set the interval low (2 seconds) and manually toggle a switch. This has limited use

Is there any way to use the system clock to simulate a pulsed input?

Thanks

Mongoid

If you Set up a rung that examines the system time one second,
and use the bit zero of that one second word,
you will be able to simulate a one seond on,
then one second off alternating output.

Hi Gil,

That sounds great. Any idea how to access bits of stored words in this software? I can't find much. I banged my head against the wall trying to find a TT bit in this software only to find(from a post here) that you have to create it yourself using the conditions for rising edge, and Q (DN bit).If the rising edge is true and Q is not true then TT.
Mickey had a post that referenced using the free running clock but there doesnt appear to be an equivalent in Connected Components.

Thanks,

Mongoid

In Rockwell RSLogix 5 and 500 software the address would be S:xx/0
xx being the address of the seconds,

Another option could be to create a 2 second timer and use address T4:xx/0

What Software package are you using.

You can roll your own... make a timer that turns itself off after 2sec then starts over again

Then use that done bit to flash your pulse

Try something like this http://forums.mrplc.com/index.php?showtopic=23153 see Mark's example.. that may work

Thank you

Thanks folks,

Cool. I never thought of using my own variable to use as the pulse input. It was easy to create a pulse using the built in TONOFF function block, after looking at your suggestion from Mark.

Mongoid

Great,

Thanks for posting it... it should help others that are trying something similar :site: