Hello, I have been working with an intregration Project with multiple of Micro 612 and ABB 800xA using modbus. I got most figured out but looking for a register for Child status on the I/O Expansion link. I can make a heartbeat program but its over 80 plcs so would be neat to just read a status register. Old stuff and cant find any soft manual Micro 612 I/O expansionlink Thanks in advance. John.