HMI and SCADA

[NotaMaster]

Hello, can i use the same address for my HMI and SCADA? Example for the button in my HMI is %M8 and i use the same address for button in SCADA system?

[pturmel]

Generally not, in my experience.

[Joe E.]

Theoretically....maybe. I've worked on HMI migrations where I had old and new operating side by side and it went ok...on the bench. But I wouldn't try to do so in the field. Having two devices control the same thing is generally not a good idea.

[NotaMaster]

7 hours ago, pturmel said:

Generally not, in my experience.

Okay sir, thank you. I will use a different address just in case

[NotaMaster]

7 hours ago, Joe E. said:

Theoretically....maybe. I've worked on HMI migrations where I had old and new operating side by side and it went ok...on the bench. But I wouldn't try to do so in the field. Having two devices control the same thing is generally not a good idea.

Thank you sir, i will use a different address

[BobLfoot]

I have seen one case where this was done.  The PLC had a tag "Motor_Start_PB"  and each HMI was configured to toggle on "Motor_Start_PB" but never to hold it on or turn it off.

The PLC code then at the end of scan had an Unlatch Motor_Start_PB if it was on.

This worked, but you never knew which station started the machine.