I have an issue with Reading tags from the PLC ( it’s a S7-1500 ).
I’ve configured manually some tags as the Manual says: [S7-1500]DB1001,X0.0 for a Bolean tag inisde the DB1001
The PLC is connected and it’s seen by Ignition.
If I enable the option “OPC Read After Write” inside the Scan Class, I’m able to write the tag from Ignition to the PLC but if I set the same tag from the PLC (TIA PORTAL V14), the tag will not change value inside Ignition.
If I disable the same option (OPC Read After Write) inside the Scan Class, I’m no longer able to even write the tag from Ignition.
I’m aware that the following considerations and configurations changes must be made when using the S7-1200 and S7-1500 drivers.
Only global DBs can be accessed
The optimized block access must be turned off
The access level must be “full” and the “connection mechanism” must allow GET/PUT
Reads and Writes can not be used in TM/CT areas
And it’s all set up correctly.