hi @v.laurent
SocketTest is OK for testing the “physical” connection.
Yes once the UR is on “REMOTE” you have to activate the connection (between PLC and UR via TCON). If you then put the Robot
on “LOCAL” and back to “REMOTE” the connection will not work. you have to use TDISCON to disconnect and then again use TCON to connect. It´s a bit tricky.
Most irritating part is that you cannot see if someone has changed the operation mode on the Robot.
Greetings from Luxembourg!