1771-IBN – Discrete DC Input Module
Allen‑Bradley / Rockwell Automation · PLC‑5 series · 32 inputs · 10‑30 VDC
1771-IBN is a 32‑channel discrete DC input module for the PLC‑5 platform. It accepts 10‑30 VDC signals from sensors, switches, and pushbuttons. Features LED status per channel, 6 ms signal delay, and optoelectrical isolation. Series C, supports ½ and 1‑slot addressing.
Inputs: 32 (4×8)
Voltage: 10‑30 VDC
Signal delay: 6 ms (±2 ms)
Backplane current: 280 mA @ 5V
LED indicators: 32 (one per channel)
Technical Specifications
- Part number: 1771‑IBN
- Brand: Allen‑Bradley
- Manufacturer: Rockwell Automation
- Module type: Digital DC Input
- Input channels: 32 (4 groups of 8)
- Voltage category: 10‑60 VDC sink (source load)
- Operating voltage: 10‑30 VDC
- On‑state voltage (min): 10 VDC
- Off‑state voltage (max): 5 VDC
- Off‑state current (max): 1.7 mA
- Signal delay (On/Off): 6 ms (±2 ms)
- Backplane current: 280 mA @ 5V
- Power dissipation: 16.4 W max
- Thermal dissipation: 53.3 BTU/hr max
- Dimensions: 89×165×51 mm (3.5×6.5×2.0 in)
- Weight: approx. 0.9 kg (1.9 lb)
- Coating: Conformal coat
- Wiring arm: 1771‑WN (included)
- Enclosure: Open type
Installation, Compatibility & Maintenance
- Chassis: 1771‑A1B through 1771‑A4B
- Addressing: ½‑slot and 1‑slot I/O
- Keying: upper 18‑20, lower 14‑16
- Wire size: 22‑14 AWG (0.25‑2.5 mm²)
- Insulation: 75 °C (167 °F) min, ≤1.2 mm thick
- Wiring arm torque: 1.0 N·m
- Status LEDs: 32 (one per input)
- Protection: Optoelectrical isolation, input filtering
Suitable Devices & Applications
- Compatible with: dry‑contact switches, electromechanical transmitters, selector switches, pushbuttons, proximity sensors (PNP sourcing).
- Applications: discrete control panels, conveyor systems, packaging machines, material handling, pump stations.
Frequently Asked Questions (Expert Insight)
- Q1: What is the actual input delay, and how does filtering affect it?
The typical signal delay is 6 ms (±2 ms) for both On→Off and Off→On transitions. The built‑in digital filter reduces noise but adds this delay. For high‑speed counting, consider using a high‑speed counter module instead. - Q2: Can I mix 24 VDC and 12 VDC sensors on the same module?
Yes, as long as each sensor’s output voltage stays within 10‑30 VDC. The module is common‑sink (source load), so all inputs share the same return. Check your sensor’s sourcing/sinking compatibility. - Q3: What is the most common failure mode, and how to troubleshoot?
Most issues come from wiring shorts or loss of common (DC return). First, verify the LED status per channel – if the LED is on but the PLC bit is off, check the backplane connection. Also, ensure the 1771‑WN arm is fully seated. - Q4: Does the 1771‑IBN support 2‑wire proximity sensors?
Yes, but only if the sensor is a sourcing (PNP) type. The module’s input acts as a sink (load to common). For NPN sensors, you would need a pull‑up resistor or choose a different input module like the 1771‑IN. - Q5: Which PLC processors are compatible with this module?
Any PLC‑5 processor that supports 1771 I/O chassis, including the 1785‑L20, L40, L80, and Enhanced series. Use the correct keying bands (upper 18‑20, lower 14‑16) to avoid physical mismatch.
Oiltech Controls Review & Insight
- Reliability: The 1771‑IBN is a workhorse in legacy PLC‑5 systems. Its 32‑point density saves rack space, and the LED indicators simplify field troubleshooting.
- Compatibility: Works with all 1771 chassis. The conformal coating protects against humidity and light contaminants – ideal for industrial environments.
- Selection guide: Choose this module for standard DC inputs. For AC signals, use 1771‑IA or 1771‑IM. For high‑speed counting, consider 1771‑CFM.
Packaging, Shipping & Warranty
- Package includes: 1771‑IBN module, 1771‑WN wiring arm
- Shipping: FedEx, UPS, DHL (global)
- Dispatch: 24‑28 hours from order
- Warranty: 12 months against defects
- Returnable: Yes (terms apply)
Why Buy From Oiltech Controls?
- ✓ Over 15 years in industrial automation spares
- ✓ Worldwide delivery – fast and trackable
- ✓ Tested surplus and refurbished stock
- ✓ 12‑month warranty on all modules
- ✓ Pre‑shipment technical verification
- ✓ Support for obsolete / legacy control systems
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