PAC Control I/O Errors -539 and -534 during debug

I am running the PAC Sim and 4 errors when I run the chart. I have configured one module the GRV-ITM-12 with one i/o therocouple k. Any suggestions?

Hi nathanael, Likely what’s happening is that the I/O unit address is not configured correctly. The messages indicate the second and third attempt to communicate to the I/O unit, and then gives up.

Check your I/O unit’s IP address or hostname. I see you have SNAP PAC Sim configured at My guess is you selected Loopback for the I/O unit address, or entered the wrong IP address or hostname for your groovIO unit.

Thanks it was the Loopback setting on the I/O that i had enabled. Once I unchecked it worked perfectly. Thanks