SLC 500 - Rate of Change

kingofdarkness4 · Jan 11, 2011

Hey guys,

I am looking into implementing a rate of change function into a pressure program I am working on.

I am reading a 4-20ma signal into an analog input module connected to a slc 5/04.

What I am trying to do is look at the pressure and then 10 seconds later check it again and see if we are gaining or losing pressure. Then based upon this rate, I will use that value to change the rest of the program and display it on a HMI.

I looked into another thread using a totalizer but I am not sure it would work.

Thanks

sthompson · Jan 12, 2011

kingofdarkness4 said:
Hey guys,

I am looking into implementing a rate of change function into a pressure program I am working on.

I am reading a 4-20ma signal into an analog input module connected to a slc 5/04.

What I am trying to do is look at the pressure and then 10 seconds later check it again and see if we are gaining or losing pressure. Then based upon this rate, I will use that value to change the rest of the program and display it on a HMI.

I looked into another thread using a totalizer but I am not sure it would work.

Thanks

I am sure someone will come up with something more elegant, but how about this for a start.

Stu.....

Mickey · Jan 12, 2011

Funny, Phil used that search for his new "Google" search feature video.

See links below

http://www.plctalk.net/qanda/showthread.php?t=60589

http://www.plctalk.net/qanda/gsearch2.shtml?cx=010759363700548729232%3Asbguabkbras&cof=FORID%3A10%3BNB%3A1&ie=UTF-8&q=Rate+of+change&sa=Search#1041

iknowsomeplc · Jan 12, 2011

A very simple Logic attached.
F8:0 = Scaled value of Presssure in REAL
F8:2 = Rate of Change in REAL , sampled every 10 sec.

SLC 500 - Rate of Change

kingofdarkness4

Member

sthompson

Lifetime Supporting Member + Moderator

Mickey

Lifetime Supporting Member

iknowsomeplc

Member

Similar Topics