Hi, I was working on libraries for Pi-Plates in codesys back in 2019 too :) I was struggling with the same issue as you regarding GPIO25. Looks like you cannot access the GPIO25 outside a task eg. changing state within the library for each read/write cycles in a for loop. But I found a workaround: Connecting a optocoupler controlled by CS1 (chip select) to toggle GPIO25 towards Pi-Plate wire. and adjusting SPI communication speed/frequency and delay, I got it working. I decided to update and publish...