We are also just running 1 prog on the CP4 but using all 8 gpio¡¯s for simple zero contact sensors ip¡¯s. We find exactly the same issue that they all lock up and the only way to re-instate them is either a prog restart of a processor reboot. However as mentioned it was a fully functional program working on a CP3 for years without any problems. Tried many different FW but had more issues so remain on 2.4474.00017 and just live with the random reboots required. Nothing in the error log that looks suspicious and I have not raised this with TB.?
Miles Redbart