Hello,
I’m trying to write to a Red Lion EtherTRAK E2 via Modbus in Ignition 8.1. The OPC Item Path starts with HR and I am able to read the tag but not write to it.
Anyone have any experience with this?
Do you have any security settings configured on the tag?
No, everything is public. I have tested both analog and discrete tags with no luck. Unfortunately I’m not well versed with Modbus or Red Lion so I am reaching out to Red Lion for support as well.
As long as the tag has Read Only False, then I can’t imagine why it wouldn’t write if the tags are correctly reading.
Maybe check into this
This could also be caused by the ability to read single registers as a single register, regardless of it being part of a multi-register tag, like a 32 bit integer or similar. You can read the integer as two 16 bit integers, but you can very seldom write to only one of those registers by itself, only both at the same time, because the device knows they are part of the same register data type. What settings are you using in the modbus driver, and also can you share the OPC paths you have tried?