Siemens SIMATIC S7-1200 SM 1231 Analog Input Module, 8 Channels, 16-bit, Voltage/Current 6ES72315PF320XB0

This analog input module expands the SIMATIC S7-1200 system with eight high-resolution channels for voltage or current signals. Unlike basic input modules, it offers 16-bit resolution and galvanic isolation between channels and the backplane bus, ensuring reliable measurements in noisy industrial environments.

Highlights

• 8 analog inputs, individually configurable for voltage (±10V, ±5V, ±2.5V, ±1.25V) or current (0-20mA, 4-20mA)
• 16-bit resolution for precise signal acquisition
• Galvanic isolation between channels and backplane bus
• Diagnostics for wire break on current inputs and overflow/underflow
• Compact design for DIN rail mounting

In daily use

The SM 1231 module connects directly to sensors and transmitters, converting analog signals into digital values for the S7-1200 controller. Its fast conversion time of 625 µs per channel supports applications requiring quick response. Screw terminals ensure secure wiring, and the module operates in temperatures from -20 to +60 °C when mounted horizontally.

Full specifications

• Module type: Analog input module
• Series: SIMATIC S7-1200
• Number of inputs: 8
• Input signal types: Voltage, current
• Voltage input ranges: ±10V, ±5V, ±2.5V, ±1.25V
• Current input ranges: 0-20mA, 4-20mA
• Resolution: 16-bit
• Connection type: Screw terminals
• Galvanic isolation: Yes (between channels and backplane bus)
• Operating temperature: -20 to +60 °C (horizontal mounting)
• Power consumption: Max. 1.5 W (from backplane bus)
• Accuracy (voltage): 0.1% at 25°C
• Accuracy (current): 0.2% at 25°C
• Input impedance (voltage): > 100 kΩ
• Input impedance (current): Approx. 15 Ω
• Conversion time (per channel): 625 µs
• Diagnostics: Wire break (current inputs), overflow/underflow
• Mounting type: DIN rail

Final note

Engineered for precision and reliability in industrial automation, this module integrates seamlessly with Siemens S7-1200 PLCs.