Hello, friends.

I have been working with S7-1200 connecting this PLC as 104 Slave with one CP-8050 which is acting as 104 Master. Initially, I used CP 1243-1 IEC module 6GK27 243 1PX30-0XE0. With this module, I'm able to set/configure Connection Mode Permanent. Of course, I don't have any intermittent direct communication between PLC and CP-8050. Communication is always UP, without any ACTTERM or communication lost between these devices for a short period of time. 

However, in the latest cases, I have used CP 1243-1 module 6GK27 243 1BX30-0XE0, and in this case, I haven't been able to find and set Connection Mode Permanent. Looks like, because of that, sometimes communication between these devices is DOWN for some seconds, and you got some ACTTERM messages in the alarms. Please see No_Communication_mode picture

I really appreciate any help to find / set communication mode in CP 1243-1 module 6GK27 243 1BX30-0XE0 as Permanent communication.

Thanks

Hello friend, for another application I had the same problem, you can find the solution here. I hope you find it useful.

https://support.industry.siemens.com/cs/es/en/view/87447188