Description

SIMATIC S7-1200 G2: SB 1231 analog input, 4 AI; inputs: 4 x AI 14 bit ADC (+/-10 V, +/-5 V, +/-2.5 V or 0-20 mA/4-20 mA) General information Product type designation SB 1231, AI 4x 14 bit Supply voltage Rated value (DC) 24 V permissible range, lower limit (DC) 20.4 V permissible range, upper limit (DC) 28.8 V Input current Current consumption, typ. 30 mA from backplane bus 5 V DC, typ. 28 mA Power loss Power loss, typ. 1.4 W Analog inputs Number of analog inputs 4; Current or voltage differential inputs permissible input voltage for voltage input (destruction limit), max. 35 V permissible input current for current input (destruction limit), max. 40 mA Cycle time (all channels) max. 0.625 ms; at 400 Hz rejection Input ranges ● Voltage Yes; ±10V, ±5V, ±2.5V ● Current Yes; 4 to 20 mA, 0 to 20 mA ● Thermocouple No ● Resistance thermometer No ● Resistance No Input ranges (rated values), voltages ● -10 V to +10 V Yes — Input resistance (-10 V to +10 V) ≥1 MOhm ● -2.5 V to +2.5 V Yes — Input resistance (-2.5 V to +2.5 V) ≥1 MOhm ● -5 V to +5 V Yes — Input resistance (-5 V to +5 V) ≥1 MOhm Input ranges (rated values), currents ● 0 to 20 mA Yes — Input resistance (0 to 20 mA) < 290 Ω, > 270 Ω ● 4 mA to 20 mA Yes — Input resistance (4 mA to 20 mA) < 290 Ω, > 270 Ω Cable length ● shielded, max. 100 m; shielded, twisted pair Analog value generation for the inputs Measurement principle successive approximation Integration and conversion time/resolution per channel ● Resolution with overrange (bit including sign), max. 13 bit; + sign ● Integration time, parameterizable Yes ● Interference voltage suppression for interference frequency f1 in Hz 40 dB, DC to 60 Hz Smoothing of measured values ● Parameterizable Yes ● Step: None Yes ● Step: low Yes ● Step: Medium Yes ● Step: High Yes Errors/accuracies Temperature error (relative to input range), (+/-) 25 °C ±0.1 % / -20 °C to 60 °C ±0.2 % of the full-scale deflection Basic error limit (operational limit at 25 °C) ● Voltage, relative to input range, (+/-) 0.1 % ● Current, relative to input range, (+/-) 0.1 % Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency ● Common mode voltage, max. 12 V Interrupts/diagnostics/status information Diagnostics function Yes Alarms ● Diagnostic alarm Yes Diagnoses ● Monitoring the supply voltage Yes ● Wire break Yes Diagnostics indication LED ● DIAG LED Yes ● for status of the inputs Yes 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] 16.6 kg — global warming potential, (during production) [CO2 eq] 3.51 kg — global warming potential, (during operation) [CO2 eq] 13.3 kg — global warming potential, (after end of life cycle) [CO2 eq] -0.257 kg Ambient conditions Free fall ● Fall height, max. 0.3 m; five times, in product package Ambient temperature during operation ● min. -20 °C ● max. 40 °C; at max. voltages and max. specifications ● horizontal installation, min. -20 °C ● horizontal installation, max. 60 °C; at rated voltages, 50 % of max. specification and alternate IO active ● vertical installation, min. -20 °C ● vertical installation, max. 50 °C; at rated voltages, 50 % of max. specification and alternate IO active 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 15 mm Height 62 mm Depth 63 mm Weights Weight, approx. 30 g