ControlMaster CM30 and CM50Universal process controllers, 1 /4 and 1/ 2 DIN 4 Installation12 IM/CM/ED–EN Rev. B4.5.1 CM30 Electrical ConnectionsFig. 4.8 CM30 Electrical ConnectionsAnalogInput 3AnalogInput 4Tx PSUDigital Input / Output 3Digital Input / Output 5Digital Input / Output 6Digital Input / Output –Comms*Tx PSUAnalog Input 1Analog Input 2Relay Output 1Line*** 100 to240 V AC10 W10 to 36 V DCRear View Rear ViewRear ViewOptionBoard 1OptionBoard 2StandardConnectionsDigital Output + ExternalNCCNOAnalog / Digital Output 1Digital Input / Output 4Digital Output + ExternalDigital Input / Output 1Analog Output 2Digital Input / Output 2Digital Input / Output –**C**C**CRelay Output 2Relay Output 3Relay Output 4Neutral*Refer to rear panel for MODBUS connections **N/O (factory default) or N/C contact selection made via internal jumper links – see page 9***200 mA Type T fuse (mains AC) or 2 A Type T fuse (24 V DC) and external isolating switchOptionBoard 1aRear ViewRelayOutput 2 C**