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SIEMENS | SIMATIC S7-1200
6ES7231-5ND32-0XB0
SM 1231 Analog Input Module
4 differential analog inputs | Voltage or current measurement | 15 bit + sign
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Siemens 6ES7231-5ND32-0XB0
The 6ES7231-5ND32-0XB0 is a SIMATIC S7-1200 SM 1231 signal module with four differential analog inputs. Each channel can be configured for +/-10 V, +/-5 V, +/-2.5 V, +/-1.25 V, 0 to 20 mA or 4 to 20 mA measurement with 15 bit plus sign resolution.
Core value: four-channel high-resolution voltage and current acquisition for SIMATIC S7-1200 automation systems.
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OFFICIAL SPECIFICATIONS | 6ES7231-5ND32-0XB0
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Complete model
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6ES7231-5ND32-0XB0
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Product family
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SIMATIC S7-1200
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Product type
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SM 1231 analog input signal module
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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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180 g
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Analog inputs
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4 differential inputs
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Supported signals
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Voltage or current, channel-configurable
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Voltage ranges
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+/-10 V, +/-5 V, +/-2.5 V and +/-1.25 V
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Current ranges
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0 to 20 mA and 4 to 20 mA
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Resolution
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15 bit plus sign
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Rated supply voltage
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24 V DC
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24 V DC current consumption
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65 mA
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SM bus current consumption
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80 mA
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Power dissipation
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2.0 W
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Maximum input withstand
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+/-35 V for voltage input; +/-40 mA for current input
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Voltage input impedance
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At least 1 Mohm
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Current input impedance
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Less than 315 ohm and greater than 280 ohm
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Electrical isolation
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707 V DC field-to-logic and field-to-24 V type test; no channel-to-channel isolation
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Accuracy at 25 C
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+/-0.1% of full scale
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Accuracy from -20 to +60 C
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+/-0.3% of full scale
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Common-mode rejection
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40 dB, DC to 60 Hz
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Maximum signal cable
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100 m, shielded twisted-pair cable
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Diagnostics
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Overflow, underflow, low 24 V supply and open wire for 4 to 20 mA
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Operating temperature
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-20 to +60 C horizontal mounting; -20 to +50 C vertical mounting
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Protection and approvals
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IP20; CE, UL, CSA, FM, RCM and KC approvals; RoHS compliant
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CONTACT
STELLA
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Voltage acquisition
Measures four differential voltage channels across four selectable bipolar ranges.
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Current loops
Supports 0 to 20 mA and 4 to 20 mA process signals with channel diagnostics.
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Process instrumentation
Connects transmitters and conditioned analog signals to an S7-1200 controller.
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Modular expansion
Adds high-resolution analog capacity to a compatible SIMATIC S7-1200 station.
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Input channels
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4 differential analog inputs
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Voltage ranges
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+/-10 V, +/-5 V, +/-2.5 V, +/-1.25 V
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Current ranges
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0 to 20 mA; 4 to 20 mA
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Resolution
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15 bit plus sign
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Rated supply
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24 V DC
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Current consumption
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65 mA from 24 V DC; 80 mA from SM bus
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Input impedance
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At least 1 Mohm voltage; 280 to 315 ohm current
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Accuracy
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+/-0.1% at 25 C; +/-0.3% from -20 to +60 C
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Isolation
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707 V DC type test between field, logic and 24 V domains; channels are not mutually isolated
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1 | Mount the signal module
Install the 45 mm wide SM 1231 in the permitted S7-1200 signal-module position and observe the horizontal or vertical temperature limit.
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2 | Provide the 24 V DC supply
Use a supply within the SIMATIC S7-1200 system requirements and account for 65 mA module current plus 80 mA SM bus current.
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3 | Wire the selected measurement type
Configure each channel for its exact voltage or current range and use the documented X10 and X11 terminal allocation.
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4 | Control noise and cable length
Use shielded twisted-pair signal cable, route it away from interference sources and keep the signal run within 100 m.
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Enclosure protection
IP20; install inside a suitable control enclosure.
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Operating environment
-20 to +60 C horizontally mounted or -20 to +50 C vertically mounted.
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Approvals
CE, UL, CSA, FM, RCM and KC approvals listed for the module family.
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Materials
RoHS-compliant SIMATIC S7-1200 signal module.
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Use the module only within the documented S7-1200 installation, wiring, enclosure and environmental limits; configure each channel for the connected signal before commissioning.
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Q1. How can a buyer verify the exact 6ES7231-5ND32-0XB0?
A. Match the complete Siemens MLFB on the module and packaging. The 5ND32 code identifies the four-channel voltage/current SM 1231; it must not be confused with RTD, thermocouple or eight-channel variants.
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Q2. How can New, Used and Refurbished condition be distinguished?
A. Request current photos of the front label, side MLFB label, X10 and X11 terminals, housing latches and packaging. A new module should show no terminal marks, rail-latch wear, wiring residue, dust or replacement labeling.
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Q3. How should procurement verify the supplier?
A. Check the legal company name, registration, verifiable address, company-domain correspondence, bank-beneficiary consistency and written traceability for 6ES7231-5ND32-0XB0 before payment.
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Q4. Which technical points should an engineer confirm?
A. Confirm four differential inputs, required voltage or current range, 15 bit plus sign resolution, 24 V DC supply, isolation boundaries, 45 x 100 x 75 mm size, 180 g weight and the allowed mounting temperature.
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Q5. What physical evidence should be requested before payment?
A. Ask for dated photos or video showing the full MLFB, serial and hardware markings, terminal condition, packaging labels, seal state and dimensions. If testing is offered, request a channel-specific live-input reading for the serial-numbered module.
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Q6. Can a similar SM 1231 suffix replace this module?
A. Not automatically. The suffix defines channel count, supported signal type, accuracy, wiring and diagnostics. RTD, thermocouple and other voltage/current versions use different terminals and configuration, so engineering compatibility must be verified first.
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