PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IEC is an 8-input Analog Input Module for the PLC-5 control system. This intelligent module converts analog field signals into digital data table values for PLC processors. Communication with the programmable logic controller occurs through block transfer programming instructions. It supports signal conversion for process monitoring applications including temperature, pressure, level, and flow.
The hardware architecture provides an 8-bit conversion resolution across eight single-ended input channels. Internal optoelectrical isolation protects system backplane circuitry from external electrical transients. Built-in input filtering suppresses line noise to stabilize analog measurement readings. Status indication includes a green RUN light and a red FAULT light on the front panel.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current | 74 Miliamperes |
|---|
| Category | PLCs |
|---|
| DC Operating Voltage | 92-138 Volts |
|---|
| Max AC Off-State Current | 1.7 Miliamperes |
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| Max DC Off-State Current | 1.7 Miliamperes |
|---|
| Model Status | Earlier Model |
|---|
| Module Type | Analog Input Module |
|---|
| Number of Bits | 8 Bit |
|---|
| Number of Inputs | 8 Inputs |
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| Product Line | PLC 5 |
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| Typical AC Signal Delay (Off) | 24 (+/- 10) ms |
|---|
| Typical AC Signal Delay (On) | 24 (+/- 10) ms |
|---|
| Typical DC Signal Delay (Off) | 20 (+/- 9) ms |
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| Typical DC Signal Delay (On) | 10 (+/- 4) ms |
|---|
| Weight | 0.88 lbs (0.40 kg) |
|---|
TECHNICAL INFORMATION
Features
- Provides eight single-ended analog input channels for sensor signal acquisition.
- Uses up to 8-bit resolution for analog-to-digital signal conversion.
- Employs block transfer programming to communicate with PLC-5 processors.
- Includes optoelectrical isolation to safeguard backplane circuits against electrical transients.
- Integrates front-panel RUN and FAULT status indicators for diagnostic visibility.
- Features onboard input filtering to minimize industrial electrical noise.
TECHNICAL INFORMATION
Applications
- Temperature and pressure monitoring in industrial processing systems.
- Liquid level sensing and storage vessel monitoring.
- Flow metering across process piping and distribution networks.
TECHNICAL INFORMATION
Connections / Interfaces
- Field wiring terminates at a compatible 1771-WB wiring arm assembly.
- Interfaces with 1771 backplane connectors using designated chassis keying positions.
TECHNICAL INFORMATION
Installation Guidelines
- The module installs into a single slot of a 1771 I/O chassis.
- Insert keying bands between pins 4 and 6 on the lower connector.
- Position keying bands between pins 26 and 28 on the upper connector.
- A 1771-WB wiring arm allows module replacement without disconnecting field wiring.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure analog data exchange using standard PLC-5 block transfer read and write instructions.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1771 I/O chassis platforms and PLC-5 processors.
- Operates with the 1771-WB field wiring arm.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1771-IEC is an earlier production module within the 1771 series.
- It shares primary technical specifications with the subsequent 1771-IE module.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1771 I/O chassis platforms and PLC-5 processors. Operates with the 1771-WB field wiring arm.
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-IEC module?
The 1771-IEC converts analog field inputs into 8-bit digital values for PLC-5 processors.
Which wiring arm is used with the 1771-IEC?
The module uses the 1771-WB wiring arm to permit module replacement without rewiring.
Where are the keying bands positioned for the 1771-IEC?
Keying bands mount between pins 4 and 6 below, and pins 26 and 28 above.
What is the reference price for the 1771-IEC module?
Observed market reference pricing is approximately $438 USD. This figure is an indicative reference price only, not a final quotation.
