Hi Trygve,
Detectcount is 490 and CycleCount 1157 with means that nearly every second scan is delayed more than 100 ms. You can see some statistics of the cycle time in the PlcThread object. Can be that you have a heavy load and threads with higher priority runs first, or there is some slow I/O on this thread, maybe not responding and causing timeouts, that is causing the delay.
I doubt that this will affect the inverter problem though. I'm still not convinced that you run the latest plc code. Check with 'ps x' which plc is running and check the file for this on $pwrp_exe, and that you really create a new executable when you build the node.
/Claes