Idec plc modbus write

Hello all,
I am trying to add IDEC plc via modbus to ignition and write to the COIL/Holding Registers but unable to do so ? can you please help me on how to activate that options or settings ?

You'll need to provide more information for anyone to be able to provide assistance.

What steps have you tried? What error(s) are you getting? Show pictures of the device configuration in Ignition and one of the tag configurations for a tag that is giving you problems, with any sensitive data removed/redacted.