how to create pulse generator in s7-1200

ajit r nayak

Dear sir,


I wanted to create pulse generator for desired frequency. Please let me know how to do it.Frequency can be easily modified using watch table.

I have done following
1) using ctrl-pwm block geneated pwm signal, but limitation we cant change the frequency in watch table. Every time i need to go to device configration to change setting

2)
using Ton and toff timer , for lower frequency i am getting exact no pulse as expected through national instrument. but @ higher frequency % error will be 16%

3)
using cycling interrupt block,Here i achieved almost but problem is i already have 4 cyc interupts


please let me know solution for it

Import-User-1

ajit r nayak

Dear sir,


I wanted to create pulse generator for desired frequency. Please let me know how to do it.Frequency can be easily modified using watch table.

I have done following
1) using ctrl-pwm block geneated pwm signal, but limitation we cant change the frequency in watch table. Every time i need to go to device configration to change setting

2)
using Ton and toff timer , for lower frequency i am getting exact no pulse as expected through national instrument. but @ higher frequency % error will be 16%

3)
using cycling interrupt block,Here i achieved almost but problem is i already have 4 cyc interupts


please let me know solution for it

 please let me know how to make pulse using cyclic inteerupt

hi

what duty cycle do you need?

if 50/50 just invert the controlled bit (cyclic ob is called once every period)

You can also activate "System Clock memory bits"  from Device configuration. There's 8 different clock memory bits.

10hz, 5hz, 2,5hz, 2hz, 1,25hz, 1hz, 0,625hz and 0,5hz