SIMATIC S7-1200| Siemens | 6ES7 131-6BF01-0BA0 6ES7131-6BF01-0BA0 ET200SP Digital input module

Product Description: Siemens 6ES7131-6BF01-0BA0

The Siemens 6ES7131-6BF01-0BA0 is a compact digital input expansion module from the SIMATIC S7-1200 family. It provides eight isolated digital input channels for standard 24 V DC signals. Designed for modular installation directly on the S7-1200 backplane, it extends the CPU’s input capacity and delivers reliable signal acquisition for sensors, switches, and other field devices. The SM 131 features fast response times and integrated diagnostics, ensuring robust performance in automated systems.

Key Features

• Digital Inputs: 8 channels for 24 V DC signals
• Input Type: Sinking (NPN) or sourcing (PNP), with selectable wiring
• Nominal Voltage: 24 V DC ±20 %
• Input Current: Approx. 6 mA per channel
• Response Time: ≤1 ms for high-speed detection
• Isolation: Channel-to-channel and channel-to-backplane galvanic isolation
• Diagnostics: LED indicators for each channel (ON/OFF/fault)
• Mounting: Snap-on for S7-1200 DIN-rail mounting

Technical Specifications

• System Series: SIMATIC S7-1200
• Module Type: SM 131 Digital Input Module
• Number of Inputs: 8
• Input Voltage: 24 V DC ±20 %
• Input Current per Channel: ~6 mA
• Response Time: ≤1 ms
• Isolation: Galvanic, per channel
• Power Supply: Via backplane bus
• Dimensions (W × H × D): 40 mm × 100 mm × 75 mm
• Operating Temperature Range: 0 °C to +55 °C
• Protection Class: IP20
• Certifications: CE, cULus

Application Areas

• Expansion of digital inputs on S7-1200 PLCs
• Connection of push-buttons, limit switches, proximity sensors
• High-speed signal acquisition in machine control
• OEM and small to mid-scale automation systems

Advantages

• Compact, plug-in design for space-efficient I/O expansion
• Fast response and per-channel diagnostics for reliable operation
• Flexible input type support (PNP/NPN) for diverse field wiring
• Seamless integration and auto-recognition in TIA Portal