Data sheet 6ES7221-1BF32-0XB0 SIMATIC S7-1200, DIGITAL INPUT SM 1221, 8DI, 24V DC, SINK/SOURCE INPUT Supply voltage Rated value (DC) Yes 24 V DC permissible range, lower limit (DC) 20.4V permissible range, upper limit (DC) 28.8V Input current from backplane bus 5 V DC, max. 105mA Digital inputs 4mA per channel from load voltage L+ (without load), max. Output voltage Power supply to the transmitters Yes present Power loss Power loss, typ. 1.5W Digital inputs Number of digital inputs 8 2 in groups of 6ES7221-1BF32-0XB0 Subject to change without notice 12/04/2017 Copyright Siemens Page 1/3Input characteristic curve in accordance with IEC Yes 61131, type 1 Number of simultaneously controllable inputs all mounting positions 8 up to 40 C, max. horizontal installation 8 up to 40 C, max. 8 up to 50 C, max. vertical installation 8 up to 40 C, max. Input voltage DC Type of input voltage 24V Rated value (DC) 5 V DC at 1 mA for signal0 15 V DC at 2.5 mA for signal1 Input current 1mA for signal0 , max. (permissible quiescent current) 2.5mA for signal1 , min. 4mA for signal1 , typ. Input delay (for rated value of input voltage) for standard inputs Yes 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, parameterizable selectable in groups of four for interrupt inputs Yes parameterizable Cable length 500m shielded, max. 300m unshielded, max. Interrupts/diagnostics/status information Alarms Yes Diagnostic alarm Diagnostics indication LED Yes for status of the inputs Potential separation Potential separation digital inputs 2 between the channels, in groups of Degree and class of protection Degree of protection acc. to EN 60529 Yes IP20 Standards, approvals, certificates 6ES7221-1BF32-0XB0 Subject to change without notice 12/04/2017 Copyright Siemens Page 2/3