read loops

that is what I am suspecting.

From this input, I want to see the maximum amplitude that the positive pulse reaches. (or at least if it is above an amplitude I set)
 
Where is this analog input coming from. Why is an analog input pulsing?

I agree with Bit Bucket 07 this is not a scan time issue, it's a analog input card's update issue.
 
The PLC scan time is usually under 10ms for that model, but the analog input update time might be around 100ms (wag from memory).

EDIT: On the expansion module advanced configuration you can adjust filter settings which affect update times. The fastest for a 1762-IF4 will be 130ms and can be as slow as 530ms. The default is 450ms.

What is the duration of the pulse?

Also, can you share your logic? (zip it and attach to a post)
 
Last edited:
that would explain then - the total period is only about 200ms. So my positive pulse is about 100ms. I'm surprised it works as often as it does!

thank-you everyone for your help on this matter! I will have to find a workaround.
 

Similar Topics

Hi everyone i have a customer, who wants to show an alarm on the machine, if the I/O forces are enabled and set, on at ControlLogix L81E with...
Replies
3
Views
138
Hi Iam using monitouch hmi(V9 soft) with omron plc cj2m (CX programmer). In this I want to read a data from hmi to plc. The data was like...
Replies
0
Views
73
Hi everyone. Quick questions. On UnityPro, I want to open and quickly read tags from a .STA files witouth opening the program. I have 30 plc...
Replies
2
Views
103
Hi everyone, I am working on a project that needs to expose the SV (Set Value) of a temperature controller to a SCADA system. SCADA <-...
Replies
4
Views
134
Hello, So i managed to read the string coming from control logix and put a string display in PanelView 800. Now I am struggling to do the other...
Replies
1
Views
115
Back
Top Bottom