SIMATIC S7-1200 G2: SM 1221 digital input, 16 DI; inputs: 16x DI 24 V DC sink/source General information Product type designation SM 1221, DI 16x 24 V DC Input current from backplane bus 5 V DC, max. 90 mA Digital inputs ● from load voltage L+ (without load), max. 4.1 mA; per channel Power loss Power loss, typ. 3.2 W Digital inputs Number of digital inputs 16 ● in groups of 4 Input characteristic curve in accordance with IEC 61131, type 1 Yes Number of simultaneously controllable inputs horizontal installation — up to 40 °C, max. 16 — up to 50 °C, max. 16 vertical installation — up to 40 °C, max. 16 Input voltage ● Rated value (DC) 24 V ● for signal “0” 5 V DC or 0.5 mA ● for signal “1” 15 V DC at 2.5 mA Input current ● for signal “0”, max. (permissible quiescent current) 0.5 mA ● for signal “1”, min. 2.5 mA ● for signal “1”, typ. 4.1 mA Input delay (for rated value of input voltage) for standard inputs — Parameterizable Yes; 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms and 12.8 ms, selectable in groups of four for interrupt inputs — parameterizable No Cable length ● shielded, max. 500 m ● unshielded, max. 300 m Interrupts/diagnostics/status information Diagnostics function Yes Alarms ● Diagnostic alarm No Diagnoses ● Monitoring the supply voltage No Diagnostics indication LED ● for status of the inputs Yes ● for maintenance Yes Potential separation Potential separation digital inputs ● between the channels, in groups of 4 ● between the channels and backplane bus Yes; 707 V DC (type test) Isolation Isolation tested with 707 V DC (type test) Degree and class of protection IP degree of protection IP20 Standards, approvals, certificates Siemens Eco Profile (SEP) Siemens EcoTech CE mark Yes CSA approval No UL approval Yes cULus Yes FM approval No RCM (formerly C-TICK) Yes KC approval Yes Marine approval No Ecological footprint ● environmental product declaration Yes; type 2 acc. to ISO 14021 Global warming potential — global warming potential, (total) [CO2 eq] 40.3 kg — global warming potential, (during production) [CO2 eq] 7.79 kg — global warming potential, (during operation) [CO2 eq] 32.5 kg — global warming potential, (after end of life cycle) [CO2 eq] -0.089 kg Ambient conditions Free fall ● Fall height, max. 0.3 m; five times, in product package Ambient temperature during operation ● horizontal installation, min. -20 °C ● horizontal installation, max. 60 °C; at max. voltages and max. specification ● vertical installation, min. -20 °C ● vertical installation, max. 50 °C; at max. voltages and max. specification Ambient temperature during storage/transportation ● min. -40 °C ● max. 70 °C Air pressure acc. to IEC 60068-2-13 ● Operation, min. 540 hPa ● Operation, max. 1 140 hPa ● Storage/transport, min. 540 hPa ● Storage/transport, max. 1 140 hPa Altitude during operation relating to sea level ● Installation altitude, min. -1 000 m ● Installation altitude, max. 5 000 m; Restrictions for installation altitudes > 2 000 m, see manual Relative humidity ● Operation at 25 ℃ without condensation, max. 95 % Vibrations ● Vibration resistance during operation acc. to IEC 60068-2-6 3.5 mm from 5 - 8.4 Hz, 1g from 8.4 - 150 Hz ● Operation, tested according to IEC 60068-2-6 Yes Shock testing ● tested according to IEC 60068-2-27 Yes; IEC 68, Part 2-27 half-sine: strength of the shock 15 g (peak value), duration 11 ms Pollutant concentrations ● SO2 at RH < 60% without condensation S02: < 0.5 ppm; H2S: < 0.1 ppm; RH < 60 % condensation-free Connection method required front connector No Mechanics/material Enclosure material (front) ● plastic Yes Dimensions Width 30 mm Height 125 mm Depth 100 mm Weights Weight, approx. 166 g
