Siemens 6ES7231-5QF32-0XB0 SM 1231 Analog Input 8 AI TC 16-bit

The Siemens 6ES7231-5QF32-0XB0 is the SIMATIC S7-1200 SM 1231 TC analog input signal module with 8 thermocouple inputs at 16-bit resolution. It connects directly to the S7-1200 CPU backplane and converts thermocouple signals to digital values with up to 15-bit resolution including sign. Supported thermocouple types include J, K, T, E, R, S, B, N, C, and TXK/XK(L), with temperature output in degrees Celsius or Fahrenheit.

Technical specifications:

• MLFB: 6ES7231-5QF32-0XB0
• Manufacturer: Siemens
• Product line: SIMATIC S7-1200
• Product type: SM 1231, AI 8x16 bit TC
• Analog inputs: 8 thermocouple channels
• Input range: ±80 mV voltage range
• Thermocouple types: B, C, E, J, K, N, R, S, T, TXK/XK(L) to GOST
• Resolution: 15 bit + sign
• Measurement principle: integrating
• Temperature error: ±0.1% at 25°C, ±0.2% at 55°C
• Repeat accuracy: ±0.5% at 25°C
• Common mode interference suppression: 120 dB min.
• Interference voltage suppression: 85 dB at 50/60/400 Hz
• Input resistance (±80 mV range): 1 MOhm
• Supply voltage: 24 V DC
• Current consumption: 40 mA (24 V DC), 80 mA (5 V DC backplane bus)
• Power loss: 1.5 W
• IP rating: IP20
• Operating temperature: -20°C to +60°C (horizontal), -20°C to +50°C (vertical)
• Storage temperature: -40°C to +70°C
• Dimensions (WxHxD): 45 x 100 x 75 mm
• Weight: 220 g
• Certifications: CE, UL, cULus, CSA, FM, RCM, KC, Marine

Features and benefits:

• Supports 10 thermocouple types including TXK/XK(L) to GOST standard
• Selectable temperature units in degrees Celsius or Fahrenheit
• Parameterizable smoothing of measured values for signal stability
• Wire break and supply voltage diagnostics with diagnostic alarm output
• Status and maintenance LEDs for local diagnostics indication
• 85 dB interference voltage suppression at 50, 60, and 400 Hz

Applications:

• Temperature monitoring in industrial process control systems using S7-1200 PLCs
• Multi-channel thermocouple acquisition in furnace and heating system automation
• HVAC and environmental monitoring applications requiring Celsius/Fahrenheit output
• Machine building applications requiring diagnostic-capable analog I/O expansion

Compliant with CE, UL, CSA, FM, and marine approvals. Part of the Siemens SIMATIC S7-1200 range.

Also known as: Siemens 6ES7231-5QF32-0XB0, SIMATIC S7-1200 SM 1231 TC, S7-1200 8-channel thermocouple input module.