PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IV is an eight-point digital input module for PLC-5 systems. This module interfaces direct-current field sensors with the PLC processor data table. It translates external DC voltages into logic-level signals used by control programs. Optical isolation protects backplane logic circuits against industrial electrical transients.
The unit operates across a nominal 12 to 24 Volt DC range. It handles sink loads with source-configured field devices rated up to 60 Volts DC. Wiring connects to a swing-arm termination assembly, enabling module removal without disturbing field conductors. Front-panel status indicators show individual channel input states during standard operation.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | PLC 5 |
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| GTIN | 10612598002471 |
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| Weight | 1.81 lbs (0.82 kg) |
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| Module Type | Digital DC Input Module |
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| Number of Inputs | 8 Inputs |
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| Voltage Category | 10-60 Volts DC, Source (Sink Load) |
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| DC Operating Voltage | 12-24 Volts |
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| Backplane Current | 74 Miliamperes |
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| Max DC Off-State Current | 3.0 Miliamperes |
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| Typical DC Signal Delay (On) | 15 (+/- 7) ms |
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| Typical DC Signal Delay (Off) | 50 ms |
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| Wiring Arm | 1771-WH |
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| Model Status | Earlier Model |
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| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
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| Mounting | Rack Mountable |
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| UPC | 10612598002471 |
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TECHNICAL INFORMATION
Features
- Provides eight DC input channels with individual red status indicators.
- Contains optoelectrical isolation to protect system logic from electrical transients.
- Incorporates input filtering circuitry to reduce industrial electrical noise.
- Supports 1/2-slot, 1-slot, and 2-slot addressing modes in compatible chassis.
- Allows module exchange without rewiring via detachable wiring arms.
TECHNICAL INFORMATION
Applications
- Sink DC input signal termination in industrial control environments.
- Direct interface for 12 to 24 Volt DC field-side sensing devices.
- Discrete signal acquisition within Allen-Bradley PLC-5 control systems.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to 1771-WA or 1771-WH detachable field wiring arms.
- Interfaces with 1771 chassis backplane supplying 74 milliamperes current load.
- Terminates sink-load configurations for external DC sourcing sensors.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module into any available slot of a 1771 I/O chassis.
- Place lower connector keying bands between pins 8 and 10.
- Place upper connector keying bands between pins 12 and 14.
- Secure the wiring arm firmly before energizing field circuits.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure chassis backplane jumpers to support 1/2, 1, or 2-slot addressing.
- Verify DC input voltage polarity matches source-device field connections.
TECHNICAL INFORMATION
Compatibility
- Installs directly in Allen-Bradley 1771 I/O chassis architectures.
- Operates with Allen-Bradley PLC-5 programmable logic controllers.
- Uses 1771-WA and 1771-WH field wiring arms for field terminations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSInstalls directly in Allen-Bradley 1771 I/O chassis architectures. Operates with Allen-Bradley PLC-5 programmable logic controllers. Uses 1771-WA and 1771-WH field wiring arms for field terminations.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
Which wiring arms work with the 1771-IV module?
The 1771-IV module works with the 1771-WA and 1771-WH wiring arms.
What are the slot keying positions for the 1771-IV?
Lower keying bands mount between pins 8 and 10. Upper keying bands mount between pins 12 and 14.
What is the reference price range for the 1771-IV?
Observed market reference pricing spans 76.00 to 189.00 USD. This data is indicative reference pricing only, not a final quotation.
What operating voltage does the 1771-IV require?
The module operates on a nominal direct-current range of 12 to 24 Volts DC.
