Hi, I got an installation that need to communicate with a other, external installation. 

A PN/PN Coupler makes the bridge between both installations. 

When my installation is powered off during a while ( during a whole week-end, for exemple) I got the Siemens ID 16#06:4040 and 16#06:4000. 

This is True until I make a Stop/Run at the PLC (1512 SP). 

Thats the only situation where this problem happen's. 

The Diagnose Buffer tells me to check the connection on the coupler, but those are good.  

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Split from S7-1500F Diagnostic buffer error ID 16# 06:4040 e 4000.