help

yazan · Apr 8, 2006

when the input changes very fast how can i delay the input ingeneral
note:
i am a student so please give me the answer in the ladder diagram

Steve Bailey · Apr 8, 2006

When the input changes too fast, a standard PLC input can no longer detect it. You need either an interrupt input or a high speed counter.

panic mode · Apr 8, 2006

or device to stretch pulse

jstolaruk · Apr 8, 2006

If the input is actually not so fast that it can be read by the PLC in one scan, I've seen this method used to extend a input pulse. The ladder is AB RSLogix. I'll leave the question mark as an exercise.



   |                                     +--------+

   |--+---| |------+---------------------| TON    |---(en)

   |  |   input    |                     | t4:0   |---(tt)

   |  |            |                     |        |---(dn)

   |  +---| |------+                     +--------+

   |      t4:0.?

   |

help

yazan

Member

Steve Bailey

Lifetime Supporting Member + Moderator

panic mode

Member

jstolaruk

Lifetime Supporting Member

Similar Topics