Signal Board (AI 1x16 bit RTD)

Siemens 6ES7231-5PA30-0XB0 is a signal board for the SIMATIC S7-1200 programmable logic controller. It provides a single analogue input channel for connecting resistance thermometers (RTDs) such as Pt100, Pt200, Pt500, and Pt1000, as well as measuring resistance and low-voltage signals.

Key Features

• Type: Signal Board SB 1231, Analogue Input (AI 1x16 bit RTD)

• Analogue Inputs: 1 channel

• Supported Input Types:

  • Resistance Thermometer: Pt100, Pt200, Pt500, Pt1000

  • Resistance: 0–150 Ω, 0–300 Ω, 0–600 Ω

  • Voltage: ±80 mV (not for thermocouples or current signals)

• Resolution: 15 bit + sign (overrange)

• Input Resistance: ≥10 MΩ (for voltage input)

• Maximum Input Voltage (Destruction Limit): ±35 V

• Measurement Principle: Integrating

• Noise Rejection: 85 dB at 10/50/60/400 Hz

• Common Mode Rejection: >120 dB

• Power Supply: 24 V DC (current consumption typical 5 mA), 5 V DC from backplane bus (typical 20 mA)

• Power Loss: Typical 0.5 W

• Cable Length: Up to 100 m (shielded, twisted pair)

• Wire Resistance: Max. 20 Ω, 2.7 Ω for 10 Ω RTD

• Temperature Measurement Units: Adjustable (degrees Celsius or Fahrenheit)

• Diagnostics:

  • Diagnostic alarm: Yes

  • Diagnostic messages: Wire break, overflow/underflow

  • Diagnostic indication LED: Yes (for status and maintenance)

• Protection: IP20

• Operating Temperature: -20°C to +60°C (horizontal), -20°C to +50°C (vertical)

• Storage Temperature: -40°C to +70°C

• Relative Humidity: Up to 95% at 25°C (non-condensing)

• Dimensions: 38 mm (width) × 62 mm (height) × 21 mm (depth)

• Weight: Approx. 35 g

• Certifications: CE, CSA, FM, RCM, RoHS, REACH compliant

Applications

• Temperature measurement with Pt100, Pt200, Pt500, or Pt1000 RTDs

• Resistance measurement (0–150 Ω, 0–300 Ω, 0–600 Ω)

• Low voltage measurement (±80 mV)

• Process monitoring and control with SIMATIC S7-1200 PLCs