There is a problem writing some tags to a Modbus device.
Reading all goes OK, but there are tags which allows only writing.
On Tag Editor at Access Rights I can choose only Read Only, Read/Write and Custom
The Custom ones allows read/write according with roles.
Testing the tag in gateway, with the OPC Quick Client goes OK. There we have the [s][r][w] options.
Choosing the [w] option the tag get written just perfect.
On designer, choosing the read/write option the project will poll the tag using Function 3.
Capturing with the wireshark shows at Function 3 that specific tag we get response “Illegal data address”
So what can be done in order to just write only once to tags, without polling.
Thanks in advance