PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IF is an analog input module for the PLC-5 control architecture. It interfaces analog field devices with PLC processors using block transfer programming. The module converts field analog signals into numeric data table values. It features optoelectrical isolation to safeguard backplane circuitry against electrical transients. Internal input filtering attenuates electrical noise on incoming process channels.
This hardware unit supports eight single-ended input channels occupying a single chassis slot. It accepts standard voltage spans including zero to ten volts DC. It also accommodates milliamp current process loops. Front-panel indicators display operational run status and detected module fault conditions. A removable 1771-WB wiring arm facilitates field replacement without disconnecting terminal leads.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Category | PLCs |
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| Product Line | PLC 5 |
|---|
| Weight | 2.00 lbs (0.91 kg) |
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| Module Type | Analog Input Module |
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| Number of Voltage or Current Inputs | 8 Single-Ended |
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| Number of Bits | 12 Bit |
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| Analog Inputs | 0-10 Volts |
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| Backplane Requirement | 1.3 Amperes at 5 Volts DC |
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| Backplane Current | 74 Miliamperes |
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| Max AC Off-State Current | 1.7 Miliamperes |
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| Max DC Off-State Current | 1.7 Miliamperes |
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| Typical AC Signal Delay (On) | 24 (+/- 10) ms |
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| Typical DC Signal Delay (On) | 10 (+/- 4) ms |
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| Typical AC Signal Delay (Off) | 24 (+/- 10) ms |
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| Typical DC Signal Delay (Off) | 20 (+/- 9) ms |
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| Mounting | Rack Mountable |
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TECHNICAL INFORMATION
Features
- Eight single-ended analog input channels for voltage and current signals.
- Data communication via PLC processor block transfer instructions.
- Optoelectrical isolation between process input signals and backplane logic.
- Internal input filtering to suppress field noise and transients.
- Front-panel LED indicators displaying RUN and FAULT status.
- Compatibility with the 1771-WB field wiring arm for fast maintenance.
TECHNICAL INFORMATION
Applications
- Temperature and pressure monitoring in continuous processing plants.
- Liquid level measurement in storage and treatment tanks.
- Flow rate telemetry interfacing with differential pressure transmitters.
- Analog variable monitoring across legacy PLC-5 automation racks.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects to field wiring through the 1771-WB field wiring arm.
- Left connector keying bands install between pins 6 to 8 and 22 to 24.
- Right connector keying bands install between pins 4 to 6 and 32 to 34.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into a single slot of an Allen-Bradley 1771 I/O chassis.
- Position chassis keying bands at designated pin locations prior to module insertion.
- Secure field signal conductors to the 1771-WB wiring arm.
- Verify supply power is disconnected before seating or removing the unit.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure PLC block transfer write (BTW) instructions to establish channel input ranges.
- Execute block transfer read (BTR) instructions to retrieve converted digital data.
- Verify channel scaling parameters align with the connected sensor output ranges.
TECHNICAL INFORMATION
Compatibility
- Installs in any standard Allen-Bradley 1771 I/O chassis.
- Communicates with Allen-Bradley PLC-5 programmable controllers.
- Utilizes the Allen-Bradley 1771-WB wiring arm for terminal terminations.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1771-IF belongs to the legacy 1771 I/O hardware platform.
- The 1771-WB wiring arm allows module exchange without disturbing field wiring.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSInstalls in any standard Allen-Bradley 1771 I/O chassis. Communicates with Allen-Bradley PLC-5 programmable controllers. Utilizes the Allen-Bradley 1771-WB wiring arm for terminal 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
What is the primary function of the Allen-Bradley 1771-IF module?
The module converts field analog signals into digital values for Allen-Bradley PLC-5 processors using block transfer programming.
How many input channels does the 1771-IF provide?
The unit provides eight single-ended analog input channels for current and voltage instrumentation.
Which field wiring arm is required for the 1771-IF?
The module mates with the Allen-Bradley 1771-WB wiring arm to enable replacement without re-terminating wires.
What is the reference price range for the 1771-IF?
Observed market reference pricing is around $289.00 USD. This figure is an indicative market reference only, not a final quotation.
