Hello!

Im working with TIA Portal V18 update 5 and WinCC Advanced/Unified PC V18 update 5.

HMI panel is MTP700 Unified Basic version 18.0.0.3.

PLC Siemens CPU 1214C.

My issue is:

Using button PRESS event with SetTagValue(1) and RELEASE with setTagValue(0) i can't modify the PLC boolean variable. Same thing for SetBitIntag(0). 

I can read all variables from PLC, also can enter integer data with IO Field.

PLC have Access level set to Full access.

Certificate is valid. Time on PLC and HMI is the same.

Problem exist on physical HMI as on simulation.

PLC DB:

HMI tags:

Button event:

Simulation:

Hello!

The fallowing conditions from WinCC Unified: Additional notes on certain system functions for tag modification, SetBitInTag and ResetBitInTag are met:

• The connection to the PLC is set up.
• The acquisition mode of the tags is "Cyclic in operation".
• The tag is used at the "Process value" property of an object.

Still can't modify values.

Okay,

I have tried other Unified Panel and added MTP400 to my project. All succeded.

Installed again Unified Images for TIA Portal and newly added MTP 700 image had working functionality. 

Solved.