Input/output extension for the easyE4 series control relays with a rated operating voltage of 24 VDC. This extension provides 4 digital inputs for 24 VDC, 4 transistor outputs for 24 VDC. The connections are made via screw terminals. The connection to the easy-E4 control relay or another easy-E4 extension is made using the easy-E4-CONNECT1 connector plug (item Y7-197225) which is included in the scope of delivery.