Modbus 06 Write Function

Ignition
1

I need to write a value into a Modbus Register that is defined as Write Only using 06 function.
Is there a way to define a Tag that writes into a register but doesn’t read from it?

If I define the tag as Read/Write it becomes in error, it returns null value and it doesn’t write into the destination register, I suppose because the register cannot be read.

Many thanks
Claudio

2

You can’t define a write-only tag, but you can write to the register from scripting using system.opc.writeValue().

3

i have the same issue,

is there another solution to write to modbus register spesific bits, for example i want to write to register 157 bit 6, instead using script?

thanks :smiley: