B&R X20DC1176
Product Series: B&R X20 I/O System (X20DC Series)
Product Introduction: The X20DC1176 is a 16-channel digital input module with PNP (sourcing) input configuration for the B&R X20 distributed I/O system. It is specifically designed for connecting 2-wire PNP-type sensors (proximity switches, photoelectric sensors) directly to the X20 controller without requiring external pull-down resistors.
Detailed content
Technical Specifications:
- Number of Channels: 16 digital inputs (2 groups of 8 channels)
- Input Type: 24V DC, PNP (sourcing / positive logic)
- Input Voltage Range (High Level / ON): 15V to 30V DC
- Input Voltage Range (Low Level / OFF): 0V to 10V DC
- Input Current (Typical): 3 mA per channel (sourced from sensor)
- Response Time (ON→OFF / OFF→ON): < 1 ms (typical), filter adjustable (0.1 ms to 25.6 ms)
- Isolation: Channel-to-channel isolation, group-to-group isolation
- Rated Insulation Voltage: 500 V AC (IEC 61131-2)
- Supply Voltage: 24V DC via X20 bus connector
- Power Consumption: Approx. 2.0 W
Functional Features:
- Per-channel LED status indicator (green = ON, off = OFF)
- Wire-break detection per channel (diagnostic bit)
- Short-circuit detection per channel (diagnostic bit)
- Configurable input filter per channel (0.1 ms to 25.6 ms)
- Hot-swap capable
- Overvoltage protection: 36V DC clamp (integrated)
- PNP-optimized — no external pull-down resistors required for 2-wire PNP sensors
Structural Features:
- Form Factor: 45 mm width, X20 standard
- Mounting: DIN rail 35 mm / direct screw
- Connector: X20 system bus (top)
- Terminal Type: Push-in spring clamp, 0.14 mm² to 2.5 mm²
- Housing Material: Polycarbonate (PC), UL94 V-0
- Protection Rating: IP20
- Dimensions (W × H × D): 45 mm × 90 mm × 75 mm (approx.)
- Weight: Approx. 120 g
Operating Conditions:
- Operating Temperature: -25°C to +70°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5% to 95% (non-condensing)
- Vibration: 5 m/s² (IEC 60068-2-6)
- Shock: 30 g (IEC 60068-2-27)
Applicable Industries:
- 2-wire PNP proximity sensor interface (inductive, capacitive, photoelectric)
- Safety light curtain input (PNP type)
- Pushbutton and selector switch monitoring
- Encoder input (A/B/Z channels, PNP output encoders)
- Valve position feedback (PNP solenoid valves)
- Presence detection on conveyor systems
Installation Requirements:
- DIN rail 35 mm (EN 60715)
- Wire size: 0.14–2.5 mm² copper conductors
- Wiring for 2-wire PNP sensor: Brown (24V) → sensor V+, Blue (0V) → sensor V-, Black (output) → X20 input terminal
- Minimum 10 mm spacing between modules
- For long cable runs (> 10 m), enable input filter
Usage Precautions:
- This module is PNP (sourcing) only — do not connect NPN sensors directly
- Do not exceed 30V DC on any input terminal
- Do not apply AC voltage
- For NPN sensors, use X20DN series module instead
- Enable input filter for noisy environments or long cable runs
Advantages & Highlights:
- 16 PNP channels in 45 mm width — highest density for sourcing inputs
- Native PNP support eliminates external pull-down resistors — reduces wiring cost
- Adjustable input filter prevents false triggers from EMI
- Full per-channel diagnostics enable condition-based maintenance












