OPC Communication

[Helpme33]

How can I know in my strategy if the communication with the OPC server is OK

[philip]

You could setup one of the OPC clients to regularly write to an OPC variable and monitor this in your strategy. Basically setup your own watchdog.

[Helpme33]

Thank you for your reply

But I would like to do this without OPC variable

[philip]

I’m not sure if a read & clear works from OPC server, one topic on here suggests it doesn’t, but it may be worth testing again: OPC Read & Clear Counter

You can then have the OPC client call a read and clear and monitor this from your strategy.

Another idea (probably a bit out there), is to write a chart so your strategy is an OPC client to verify communication, essentially writing a simple OPC client. Not sure if anyone has done that before.

[mstjohn]

You could use PAC Display (as an OPC client) via this method:

Best way to detect if communications is lost between Controller and Brains

Hey Watchdog Fans, For those of you wanting to keep track of PAC Display (if it’s still running) from within your PAC strategy, I tried out PilotMan’s suggestion of using the Alarm features in PAC Display. It was nice and simple and worked great! Here’s how I implemented his idea: I have some looping OptoScript with two int32 variables used with PAC Display, and a string to show the current status. // Initialize the value that PAC Display should set to 1 nPAC_Display_to_Increment = 0; …