Dear Gents,

those the communication STOP between two S7-300 PLC's over S7 communication FB14 "GET" when the CPU goes to STOP?

Communication is integrated over CPU internal port.

Does the function block FB14 if the communication stops when the CPU goes to STOP receives error signal?

Thank you,

Kind regards,

Hi,

perhaps I understand your question wrong but if CPU stops there will be no call of your / any FB and so it will not give back an error...

Regards

Hi,

thank you for the answer. You have answered my questions.

Thank you,

Kind regards,

Nikola

Towome

perhaps I understand your question wrong but if CPU stops there will be no call of your / any FB and so it will not give back an error...

 Actually this is not the complete answer. If two PLCs A and B communiate with each others using Get functions, and PLC B goes to stop, the following happens.

- The PLC B no longer reads PLC A.
- The PLC A continues reading data from PLC B. I don't think the PLC A will even notice that PLC B has gone to stop.

From "GET" function help: "The remote CPU can be in the operating state RUN or STOP". (Select FB14 and push F1.)

Elonen Hi,

thank you.

This is the correct answer i was looking for. I am trying to implement redundancy between two S7-300 CPU over FB14 GET. I will read error states and stop status of master CPU and if i get it i will start the SLAVE CPU to execute my redundant code.

Thank you,

Kind regards,

Nikola