PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IT is a PLC-5 fast digital input module designed for Bulletin 1771 I/O chassis installations. This unit provides eight fast-response DC input channels for industrial automation control. It operates within a nominal DC voltage category of 10 to 60 V DC. The operating voltage range spans from 12 to 72 V DC in sink configurations. Rapid signal acquisition enables rapid detection of short-duration field signals.
The module draws 74 mA of backplane current from the local Bulletin 1771 chassis. It interfaces with field wiring using standard 1771-WH or 1771-WA wiring arms. Its typical on-state signal delay measures 0.6 ms with a 0.2 ms tolerance. The assembly weighs approximately 0.88 lbs and mounts directly into any compatible 1771 chassis slot.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Product Line | PLC 5 |
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| UPC | 662468205641 |
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| Weight | 0.88 lbs (0.40 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, Sink (Source Load) |
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| DC Operating Voltage | 12-72 Volt |
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| Backplane Current | 74 Miliamperes |
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| Max DC Off-State Current | 1.3 Miliamperes |
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| Typical DC Signal Delay (On) | 0.6 (+/- 0.2) 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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TECHNICAL INFORMATION
Features
- Provides eight fast-response DC input channels.
- Operates over a DC voltage range of 12 to 72 V DC.
- Offers a typical turn-on signal delay of 0.6 ms.
- Consumes 74 mA backplane current from the 1771 chassis.
- Supports wiring connection through 1771-WA or 1771-WH wiring arms.
TECHNICAL INFORMATION
Applications
- Fast event detection in Bulletin 1771 PLC-5 automation systems.
- High-speed machine monitoring requiring minimal signal propagation delay.
- DC sensing circuits utilizing sink input configurations.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to field devices via 1771-WA or 1771-WH wiring arms.
- Mates directly with the Bulletin 1771 chassis backplane connector.
TECHNICAL INFORMATION
Installation Guidelines
- Disconnect all power sources before inserting or removing the module.
- Align the printed circuit board with chassis card guides.
- Slide the module firmly until it locks into the backplane.
- Attach and latch the wiring arm securely onto the chassis.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley Bulletin 1771 I/O racks.
- Communicates with Allen-Bradley PLC-5 system processors.
- Supports 1771-WA and 1771-WH wiring arm assemblies.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley Bulletin 1771 I/O racks. Communicates with Allen-Bradley PLC-5 system processors. Supports 1771-WA and 1771-WH wiring arm assemblies.
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
What is the signal delay time of the Allen-Bradley 1771-IT?
The 1771-IT features a typical DC turn-on delay of 0.6 ms (+/- 0.2 ms) and an off-delay of 50 ms.
Which wiring arm is required for the 1771-IT module?
The module uses either the 1771-WA or the 1771-WH wiring arm for field wire termination.
What is the reference price for the 1771-IT module?
The observed market reference price is approximately 89.00 USD. This is an indicative market reference only and not a final quotation.
