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Copy| Product Name | Siemens 6ES7231-5ND32-0XB0 | SIMATIC S7-1200 SM 1231 Analog Input Module |
| Item NO. | 2927224 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | SIEMENS |
| Brand | SIEMENS |
| Creation Time | 2026-10-26 |
Four differential 16-bit voltage-or-current inputs for the S7-1200 signal-module bus.
Siemens 6ES7231-5ND32-0XB0 is a SIMATIC S7-1200 SM 1231 analog input module with four differential channels. Each channel can be parameterized for supported voltage or current measurement, including ±10 V through ±1.25 V ranges and 0–20 mA or 4–20 mA operation.
Signal conversion in Siemens 6ES7231-5ND32-0XB0 provides 15-bit plus sign resolution and an all-channel conversion cycle of up to 100 µs in the current version. Fifty- and sixty-hertz interference suppression, channel diagnostics and supported wire-break monitoring help separate electrical problems from process changes.
The 45 × 100 × 75 mm Siemens 6ES7231-5ND32-0XB0 uses a 24 V DC field supply and draws current from the S7-1200 backplane. Its operating orientation affects the upper ambient limit, so horizontal and vertical installation conditions are checked together with shield routing and terminal access.
| Technical Item | Value |
|---|---|
| Brand | Siemens |
| Model | 6ES7231-5ND32-0XB0 |
| Product Name | SM 1231 AI 4-channel analog input module |
| Country | Germany |
| Input Channels | 4 differential analog inputs |
| Voltage Ranges | ±10 V, ±5 V, ±2.5 V, ±1.25 V |
| Current Ranges | 0–20 mA and 4–20 mA |
| Resolution | 15 bit + sign |
| Conversion Cycle | 100 µs maximum for all channels |
| Basic Error | 0.1% |
| Interference Suppression | 50/60 Hz |
| Field Supply | 24 V DC, typically 65 mA |
| Backplane Current | 5 V DC, typically 80 mA |
| Power Dissipation | 1.8 W |
| Operating Temperature | −20 to 60 °C horizontal; −20 to 50 °C vertical |
| Degree of Protection | IP20 |
| Dimensions (W × H × D) | 45 × 100 × 75 mm |
| Approximate Weight | 180 g |
Each input on Siemens 6ES7231-5ND32-0XB0 measures between its assigned terminal pair. Keeping the positive, negative and reference conductors with the same transmitter prevents another channel or cabinet common from becoming an unintended part of the measurement loop.
Siemens 6ES7231-5ND32-0XB0 applies the voltage or current measuring method configured for each connected circuit and updates the CPU with the converted raw value. The program then scales that value into the engineering unit used for display, alarming or control.
Alongside the measured value, Siemens 6ES7231-5ND32-0XB0 provides channel evidence such as overflow, underflow or supported wire-break behavior. The application can use this state to distinguish a process limit from a disconnected or incorrectly configured field circuit.
Remove power, place Siemens 6ES7231-5ND32-0XB0 in the planned S7-1200 signal-module position and seat the bus connector before attaching field wiring. Label each transmitter cable and terminal pair against the project channel list so adjacent analog loops cannot be exchanged during termination.
Connect each voltage or current loop to the specified pair on Siemens 6ES7231-5ND32-0XB0, preserving polarity and the correct reference arrangement. Route analog cables away from relay, motor and drive conductors, and terminate shields according to the cabinet grounding plan without using the shield as a signal return.
Select the measuring method and interference suppression for each used input of Siemens 6ES7231-5ND32-0XB0, then download the hardware configuration. Apply a known signal, confirm the raw value and diagnostics, and verify program scaling before enabling alarms or automatic control based on that channel.
Compare the actual terminal voltage or current with the range configured for that Siemens 6ES7231-5ND32-0XB0 channel. Incorrect mode, reversed wiring or a signal above the selected span can all produce overflow.
For Siemens 6ES7231-5ND32-0XB0, trace the current loop from its power source through the transmitter, input and return. Confirm the diagnostic is enabled for a supported mode before treating the indication as a broken conductor.
Select the appropriate 50/60 Hz suppression for Siemens 6ES7231-5ND32-0XB0, inspect shield termination and move analog cables away from power switching conductors. A shared routing problem can affect multiple channels together.
Siemens 6ES7231-5ND32-0XB0 channels are parameterized for their intended measuring type. Confirm every terminal pair and software range individually so a current loop is not connected to a voltage-configured channel.
The permitted upper ambient temperature for Siemens 6ES7231-5ND32-0XB0 is lower in vertical installation than in horizontal installation. Recheck orientation, ventilation and measured cabinet temperature.
Record each Siemens 6ES7231-5ND32-0XB0 channel's measuring type, range, suppression, diagnostics, scaling and terminal wiring. Restoring the module without those parameters can produce plausible but incorrect engineering values.
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