Digital input modules can be used to connect the PLC to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches (BERO). | CA 01 Digital modules - SM 321 digital input Digital modules - SM 321 digital input Overview Digital inputs For connecting standard switches and two-wire proximity switches BERO Application Digital input modules can be used to connect the PLC to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches BERO . Design Digital input modules are characterized by the following mechanical features Compact configuration The rugged plastic housing contains - Green LEDs to indicate signal states at the inputs - Slot for front connector protected by a front cover - Labeling area on the front cover. Easy installation There are no slot rules the addresses of the inputs are predetermined by the slot. When they are used in the ET 200M in combination with active bus modules hot-swapping is possible. User-friendly wiring Function Digital input modules convert the levels of the external digital signals from the process into the internal signal level of the PLC. Technical specifications Seite 1 von 5 CA 01 Digital modules - SM 321 digital input 6ES7 321-1BH02-0AA0 6ES7 321-1BH50-0AA0 6ES7 321-1BL00-0AA0 6ES7 321-1BH10-0AA0 Voltages and currents Load voltage L _ Rated value DC 24 V 24 V 24 V 24 V Current consumption from load voltage L no load 25 mA max. from backplane bus 5 V DC 10 mA 10 mA 15 mA 110 mA max. Power dissipation typical W W W W Connection system Requisite front connector 20-pin 20-pin 40-pin 20-pin Clock synchronism Clock synchronous operation No No No Yes Digital inputs Number of digital inputs 16 16 32 16 Number of inputs that can be driven in parallel vertical mounting positions _ up to 40 C 16 16 32 16 horizontal mounting positions _ up to 40 C 32 _ up to 60 C 16 16 16 16 Length of cable _ Length of cable shielded 1 000 m 1 000 m 1 000 m 1 000 m max - Length of cable unshielded 600 m 600 m 600 m 600 m max Input characteristic to comply Yes Yes Yes Yes with IEC 1131 Type 1 Input voltage _ Rated value
