# Writing to plc5 over ethernet

**URL:** <https://forum.inductiveautomation.com/t/writing-to-plc5-over-ethernet/8803>\
**Category:** Ignition\
**Created:** [July 28, 2014, 10:40pm UTC](https://forum.inductiveautomation.com/t/writing-to-plc5-over-ethernet/8803 "2014-07-28T22:40:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![giles](https://avatars.discourse-cdn.com/v4/letter/g/c68b51/32.png) [@giles](https://forum.inductiveautomation.com/u/giles)\
**Post date:** [July 28, 2014, 10:40pm UTC](https://forum.inductiveautomation.com/t/writing-to-plc5-over-ethernet/8803/1 "2014-07-28T22:40:36Z")

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I am using a datalink GW1000-abiep board and your OPC-UA server to talk to an AB plc5 it converts from ethernet to DH+I find that I cannot write to the PLC data unless I set the datalink board to Force messages to single DH+ Node.

ie if I do jno0t have this set I can use an ip + dh+ node like 192.168.1.60,01. It reads data fine but does not set it - giving an unknown error.

However if I force it to route all messages to 01 and use 192.168.160 without the DH+ node then I can write to it.

It doesn’t actually matter currently for me because I have only one board but it seems a mighty shame.

also I found I had to use Zero TNS connection - what’s that all about?

many thanks 🙂🙂