Elobau 485 EPA 04 eloProg output expansion The output expansion extends the number of safe OSSD (Output Signal Switching Device) outputs in steps of two or four.A maximum of 4 expansion modules of the same type can be connected to the base module. In total, a maximum of 7 expansion modules is possible.+ 2 safe transistor outputs (pairs) (PNP) / 400 mA+ 4 safe transistor outputs (pairs) (PNP) / 400 mA+ 2 control outputs, programmable+ 2 EDM (External Device Monitoring) (start/restart)