Signal Board 1 analogue input (for thermocouples or voltage)

Siemens 6ES7231-5QA30-0XB0 is a signal board designed for use with SIMATIC S7-1200 programmable logic controllers. It provides a single analogue input channel for connecting thermocouples (Type J or K) or measuring low voltage signals, enabling high-precision temperature or voltage measurement directly at the PLC.

Key Features

• Type: Signal board (SB 1231, AI 1x16 bit TC)

• Number of Inputs: 1 analogue input (for thermocouples or voltage)

• Input Types Supported:

  • Thermocouples: Type J, K, T, E, R, S, B, N, C, TXK/XK(L) (voltage range: ±80 mV)

  • Voltage: ±80 mV (direct voltage measurement)

  • Current: Not supported

  • Resistance thermometer: Not supported

• Resolution: 16 bits (including sign, 15 bits + sign for thermocouples/voltage)

• Input Resistance: ≥1 MΩ (for voltage -80 mV to +80 mV)

• Measurement Principle: Integrating

• Integration Time: Not parameterizable

• Interference Suppression: 85 dB at 10/50/60/400 Hz

• Smoothing: Parameterizable (none, low, medium, high)

• Maximum Permissible Input:

  • Voltage (destruction limit): ±35 V

  • Current (destruction limit): ±35 V (not for current signals)

• Diagnostics:

  • Diagnostic alarm: Yes

  • Diagnostic LED: Yes (status and maintenance)

• Power Supply:

  • From backplane bus: 5 V DC, typical 20 mA

  • From PLC: 24 V DC, typical 5 mA

• Power Loss: Typical 0.5 W

• Cable Length:

  • Max. shielded, twisted pair: 100 m

• Operating Temperature: Standard S7-1200 range (typically -20°C to +60°C, check your CPU specifications)

• Storage Temperature: Standard S7-1200 range (typically -40°C to +70°C)

• Protection: IP20

• Dimensions: Standard S7-1200 signal board (approx. 38 × 62 × 21 mm)

• Weight: Approx. 30 g

• Required: Front connector (not included)

• Certificates: CE, RoHS, REACH compliant

Typical Applications

• Temperature measurement with thermocouples (Type J or K)

• Low voltage measurement (±80 mV)

• Process monitoring and control with SIMATIC S7-1200 PLC