Sign in to follow this  
Followers 0
Rohan

Read Data When PLC is running rather than datatable

2 posts in this topic

I need to read the data from the PLC using .net. I have read the data using Unitronics.dll .

Steps i need to do.

1) Look if the PLC cycle is running

2) if running Fetch the data on runtime (not from data table)

3) Stop if the PLC cycle is stopped

Right now i have continuously looped after each second to see the cycle and look for the data. But the PLC cycle and my .net program cycle differs in time and  which fails to get the complete data.

Is there any Listener to do this .Please give the example for the same.

0

Share this post


Link to post
Share on other sites

It sounds like your cycle runs rather quickly if you're doing a one second poll.  

PLC model? Serial or Ethernet?

I would buffer the data in the PLC itself while the cycle is running and read the data from there after the fact.  

You're going to have a hard time synchronizing a Windows box to a PLC at that speed.

Joe T.

0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0