Clock Monitoring Address has not been set

[mohabdelmaksoud 0]

"Clock Monitoring Address has not been set"

How can I solve this ???? .. In details please.

[Michael Walsh 268]

Where did you see this message?

[Michael Walsh 268]

I see that your other posts are about the NT21, so I assume that you saw this on the front of your NT21.  You can likely fix this here:

Of course you will have to figure out the first address that contains the clock information for the PLC to which your HMI is connected.