Home > Products > SIEMENS > SIMATIC S7 Series
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Complete model
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6ES7231-5QF32-0XB0
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Product family
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SIMATIC S7-1200 SM 1231
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Product type
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SM 1231 TC 8-channel thermocouple analog input module
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Type designation
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SM 1231, AI 8x16 bit TC
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Supply voltage
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24 V DC rated
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Current consumption
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40 mA typical; 80 mA typical from 5 V DC backplane bus
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Power loss
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1.5 W typical
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Analog inputs
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8 thermocouple inputs
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Input range
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-80 mV to +80 mV; input resistance at least 1 MOhm
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Thermocouple types
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B, C, E, J, K, N, R, S, T, and TXK or TXK(L) to GOST
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Resolution
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15 bit plus sign, including overrange
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Interference suppression
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85 dB at 50, 60, or 400 Hz; common-mode suppression at least 120 dB
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Temperature error
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Plus or minus 0.1% at 25 deg C; plus or minus 0.2% to 55 deg C
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Repeat accuracy
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Plus or minus 0.5% at 25 deg C
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Diagnostics
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Diagnostic alarm, supply-voltage monitoring, and wire-break detection
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Protection rating
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IP20
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Operating temperature
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-20 to 60 deg C horizontal; -20 to 50 deg C vertical
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Storage temperature
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-40 to 70 deg C
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Connection
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Front connector required
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Dimensions
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45 x 100 x 75 mm (W x H x D)
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Weight
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Approximately 220 g
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Approvals
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CE, CSA, UL, cULus, FM, RCM, KC, and marine approvals
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Temperature acquisition
Eight channels measure supported thermocouple types or a plus or minus 80 mV signal range.
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Signal conversion
The integrating converter provides a maximum resolution of 15 bits plus sign including overrange.
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Noise rejection
Interference suppression is specified for 50, 60, and 400 Hz with at least 120 dB common-mode suppression.
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Value processing
Measured-value smoothing is parameterizable and temperature units can be represented in degrees Celsius or Fahrenheit.
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Thermocouple inputs
Eight analog channels accept B, C, E, J, K, N, R, S, T, and TXK or TXK(L) sensors.
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Voltage range
The module supports -80 mV to +80 mV with input resistance of at least 1 MOhm.
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Front connection
A compatible front connector is required for field wiring to the S7-1200 module.
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Backplane interface
The module uses the S7-1200 backplane bus and draws approximately 80 mA at 5 V DC.
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Diagnostic alarm
The module can report diagnostic alarms to the controller.
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Wire-break detection
Open thermocouple circuits are monitored by the integrated diagnostic function.
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Supply monitoring
The module monitors its 24 V DC supply condition.
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Status indication
Input status and maintenance information are provided by onboard indicators.
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Module dimensions
The enclosure measures 45 x 100 x 75 mm and weighs approximately 220 g.
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Mounting orientation
Horizontal operation is specified to 60 deg C and vertical operation to 50 deg C.
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Environmental range
Operation is -20 to 60 deg C; storage and transport are -40 to 70 deg C.
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Wiring preparation
Use the required front connector and thermocouple cable practices appropriate to the selected sensor type.
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Q1. How can I verify that the quoted item is exactly 6ES7231-5QF32-0XB0?
Match the complete number on the quotation, module label, packaging, and invoice. Confirm SM 1231 AI 8x16 bit TC, eight thermocouple channels, the 45 mm width, and the required front connector.
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Q2. How can I distinguish a new SM 1231 TC module from a used or refurbished unit?
Request current photos of the Siemens label, terminal area, front-connector socket, backplane connector, DIN-rail latch, LEDs, and packaging. Inspect for terminal marks, oxidation, scratches, replaced labels, or resealing.
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Q3. How should a buyer verify that the supplier is legitimate and reliable?
Check the supplier legal registration, address, bank beneficiary, business contacts, and S7-1200 transaction references. All commercial documents should consistently identify 6ES7231-5QF32-0XB0.
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Q4. Which specifications should an engineer verify before purchasing?
Verify eight TC inputs, required thermocouple types, plus or minus 80 mV range, 15-bit plus-sign resolution, 24 V DC supply, front connector, 45 x 100 x 75 mm dimensions, and 220 g weight.
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Q5. What physical evidence should be requested before payment?
Request timestamped images or video of the full label, terminal socket, backplane connector, latches, indicators, enclosure seals, packaging, and all included accessories.
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Q6. Can another SM 1231 suffix replace 6ES7231-5QF32-0XB0?
Not automatically. Similar suffixes can change channel count, RTD versus thermocouple sensing, input ranges, resolution, firmware, or connector requirements. Engineering must validate every channel and sensor requirement.
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