noorloai

Communication response Time between PLC and HMI

4 posts in this topic

Hi there,

I am using compact logix controller 1769-L36ERM with Factorytalk view SE running on BlueLine PC communicating through Ethernet/IP. I would like to perform a performance test to check how long it takes for a command to transfer from HMI to PLC and vice versa.

I tried to create a logic that set a tag in Plc and HMI reset that tag and monitor this tag in Studio5000 trend, however, this task doesn't give me what I am looking for.

Can someone help on this?

Thank you and appreciate your response in advance.

 

 

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Only thoughts..... I'm not sure how to actually monitor this time but if you view Display Settings, you'll find a Maximum Tag Update Rate setting. By default this is set to 1 second. You can set it as low as 0.05 seconds but I don't think you're actually going to get that given PLC scan and communications speed.

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you would need to close the loop and measure round trip... 

some thing like have PLC set some value, HMI read it, and write it back to PLC. 

 

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