1771-IB Allen-Bradley PLC 5 DC Input Module 8-Channel

Oiltech Controls’s Insight

The 1771-IB is a PLC 5 digital DC input module from Allen-Bradley. It reads 8 discrete DC signals (10–27V) and transfers them to the processor’s data table. This module is a reliable choice for upgrading or maintaining legacy control systems.

Key Technical Data

• Manufacturer: Rockwell Automation / Allen-Bradley
• Series: PLC 5
• Part Number: 1771-IB
• Inputs: 8 digital DC channels (sink, source load)
• Voltage Range: 10–27V DC (nominal 12V/24V)
• Backplane Current: 74 mA
• Off-State Current: ≤3 mA
• Signal Delay: On = 12 ms (±7); Off = 20 ms (±7)
• Power Dissipation: 5.7 W; Thermal = 19.3 BTU/hr
• Isolation: Opto-electrical to protect against transients
• Indicators: 8 red LEDs for field side status
• Dimensions: 3.5 x 6.5 x 2.0 in (89 x 165 x 51 mm)
• Wiring Arm: 1771-WN (included)

Installation & Compatibility

• Mount in a 1771 I/O chassis with a PLC processor.
• Keying: upper connector pins 14–16; lower pins 4–6.
• Supports ½, 1, and 2-slot I/O addressing.
• Works with dry contacts, mechanical switches, pushbuttons, and selector switches.
• Input filtering reduces electrical noise.

Suitable Equipment & Applications

• PLC 5 control systems in manufacturing, material handling, and process automation.
• Compatible with Allen-Bradley 1771 chassis and power supplies (e.g., 1771-P2).
• Ideal for retrofitting older machines or expanding I/O capacity.
• Use with 12V or 24V DC sensors, limit switches, and proximity detectors.

Oiltech Controls Review

• Proven performance in harsh industrial environments.
• Input filtering ensures stable operation in noisy plants.
• Red LEDs give instant visual status for each channel.
• Removable wiring arm (1771-WN) simplifies replacement without rewiring.

Why Buy From Oiltech Controls?

• 15+ years supplying industrial automation spares.
• Global shipping via FedEx, UPS, or DHL.
• All items tested (surplus/refurbished) before dispatch.
• 12-month warranty on every module.
• Technical verification before shipment.
• Expert support for obsolete control systems.

Frequently Asked Questions (FAQ)

• Q: Can the 1771-IB handle 5V DC signals?
  A: No, the minimum operating voltage is 10V DC. Use a signal conditioner for lower voltages.
• Q: What is the maximum cable length from sensor to module?
  A: Keep cable runs under 100 ft (30 m) to avoid signal degradation and noise pickup.
• Q: Does this module support high-speed counting?
  A: No, it is a standard DC input with typical delay (~12–20 ms). For high-speed, use a counter module.
• Q: How do I choose between 1771-IB and 1771-IBD?
  A: The 1771-IB has 8 inputs; the IBD has 16. Choose based on channel count and backplane power budget.
• Q: What if the module fails during commissioning?
  A: Check the wiring arm connection, keying, and slot addressing. If still faulty, contact us for replacement.

Shipping & Warranty

• Dispatch: 24–28 hours after order confirmation.
• Carriers: FedEx, UPS, DHL – tracked worldwide.
• Warranty: 12 months against defects.
• Return: 30-day return window (unused, original packaging).

For inquiries: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp).

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