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SIMATIC S7-1200, ANALOG INPUT, SM 1231, 8 AI, /-10V, /-5V, /-2.5V, OR 0-20MA/4-20 MA, 12 BIT SIGN OR (13 BIT ADC) |
| Supply voltage |
| 24 V DC |
Yes |
| Input current |
| Current consumption, typ. |
45 mA |
| from backplane bus 5 V DC, typ. |
90 mA |
| Power losses |
| Power loss, typ. |
1.5 W |
| Analog inputs |
| Number of analog inputs |
8; Current or voltage differential inputs |
| permissible input frequency for current input (destruction limit), max. |
± 35 V |
| permissible input voltage for voltage input (destruction limit), max. |
35 V |
| permissible input current for voltage input (destruction limit), max. |
40 mA |
| permissible input current for current input (destruction limit), max. |
40 mA |
| Cycle time (all channels) max. |
625 µs |
| Input ranges |
| ● Voltage |
Yes; ±10 V, ±5 V, ±2.5 V |
| ● Current |
Yes; 4 to 20 mA, 0 to 20 mA |
| ● Thermocouple |
No |
| ● Resistance thermometer |
No |
| ● Resistance |
Yes |
| Input ranges (rated values), voltages |
| ● -10 V to 10 V |
Yes |
| ● Input resistance (-10 V to 10 V) |
≥9 MOhm |
| ● -2.5 V to 2.5 V |
Yes |
| ● Input resistance (-2.5 V to 2.5 V) |
≥9 MOhm |
| ● -5 V to 5 V |
Yes |
| ● Input resistance (-5 V to 5 V) |
≥9 MOhm |
| Input ranges (rated values), currents |
| ● 0 to 20 mA |
Yes |
| ● Input resistance (0 to 20 mA) |
280 Ω |
| Thermocouple (TC) |
| Temperature compensation |
| — Parameterizable |
No |
| Analog outputs |
| Number of analog outputs |
0 |
| Analog value creation |
| Integration and conversion time/resolution per channel |
| ● Resolution with overrange (bit including sign), max. |
12 bit; sign |
| ● Integration time, parameterizable |
Yes |
| ● Interference voltage suppression for interference frequency f1 in Hz |
40 dB, DC to 60 V for interference frequency 50 / 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% to 55 °C ±0.2% total measurement range |
| Basic error limit (operational limit at 25 °C) |
| ● Voltage, relative to input area, ( /-) |
0.1 % |
| ● Current, relative to input area, ( /-) |
0.1 % |
| Interference voltage suppression for f = n x (f1 /- 1 %), f1 = interference frequency |
| ● common mode voltage, max. |
12 V |
| Interrupts/diagnostics/status information |
| Alarms |
| ● Alarms |
Yes |
| ● Diagnostic alarm |
Yes |
| Diagnostic messages |
| ● Diagnostic functions |
Yes |
| ● Monitoring the supply voltage |
Yes |
| ● Wire break |
Yes |
| Diagnostics indication LED |
| ● for status of the inputs |
Yes |
| ● for maintenance |
Yes |
| Galvanic isolation |
| Galvanic isolation analog outputs |
| ● between the channels and the power supply of the electronics |
No |
| Degree and class of protection |
| Degree of protection to EN 60529 |
|
| ● IP20 |
Yes |
| Standards, approvals, certificates |
| CE mark |
Yes |
| CSA approval |
Yes |
| RCM (formerly C-TICK) |
Yes |
| FM approval |
Yes |
| Marine approval |
| ● Marine approval |
Yes |
| Highest safety class achievable in safety mode |
| ● SIL according to IEC 61508:2010 |
none |
| Climatic and mechanical conditions for storage and transport |
| Climatic conditions for storage and transport |
| Free fall |
| — Drop height, max. (in packaging) |
0.3 m; five times, in dispatch package |
| Temperature |
| — Permissible temperature range |
-40 °C to 70 °C |
| Air pressure acc. to IEC 60068-2-13 |
| — Permissible air pressure |
1080 to 660 hPa |
| Relative humidity |
| — Permissible range (without condensation) at 25 °C |
95 % |
| Mechanical and climatic conditions during operation |
| Climatic conditions in operation |
| Temperature |
| — Permissible temperature range |
-20 °C to 60 °C horizontal mounting, -20 °C to 50 °C vertical mounting, 95% humidity, non-condensing |
| Air pressure acc. to IEC 60068-2-13 |
| — Permissible air pressure |
1080 to 795 hPa |
| 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 |
Yes |
| Mechanics/material |
| Type of housing (front) |
|
| ● plastic |
Yes |
| Dimensions |
| Width |
45 mm |
| Height |
100 mm |
| Depth |
75 mm |
| Weights |
| Weight, approx. |
180 g |
| last modified: |
13.10.2014 |
