PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-DE is an Absolute Encoder Module designed for PLC-5 systems. This intelligent positioning module supplies rapid response to machine position using the programmable controller scan. It accepts inputs from a 5V DC 12-bit absolute encoder. Supported data formats include binary coded decimal, natural binary, and standard Gray code. The module occupies two slots in a 1771 I/O chassis.
The module provides eight sourcing outputs handling 5 to 24V DC. Each output delivers up to 2.0 A DC continuous current without derating. Total module current reaches 16 A continuous with all eight outputs active. Output throughput across all eight channels executes in under 200 microseconds. Communication with the programmable controller occurs through block transfers.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current | 0.80 Amperes |
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| Category | PLCs |
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| Coating | Conformal Coat |
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| Inputs | 5 Volt DC 12-Bit Absolute Encoder (BDC, Natural Binary, or Gray Code Format) |
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| Max Input Frequency | 50 Kilohertz |
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| Module Type | Positioning I/O Module |
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| Module Update Period | 200 Microseconds |
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| Outputs | 5-24 Volts DC Current Sourcing 2.0 Amperes Continuous Per Output |
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| Product Line | PLC 5 |
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| Slots | 2 Slots |
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| UPC | 000100001969 |
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| Weight | 3.00 lbs (1.36 kg) |
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| Wiring Arm | 1771-WG |
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TECHNICAL INFORMATION
Features
- Accepts 12-bit absolute encoder inputs at frequencies up to 50 kHz.
- Provides eight current-sourcing outputs rated at 2.0 A DC continuous per channel.
- Delivers throughput for all eight outputs in under 200 microseconds.
- Supports BCD, natural binary, and standard Gray code encoder formats.
- Provides 1500V RMS electrical isolation between inputs and outputs.
- Operates up to 16 A continuous current across all channels without derating.
TECHNICAL INFORMATION
Applications
- Machine position tracking within Allen-Bradley PLC-5 control architectures.
- Direct high-speed output control based on absolute encoder position presets.
TECHNICAL INFORMATION
Connections / Interfaces
- Field wiring connects to the 1771-WG removable wiring arm.
- Module connects to the PLC-5 backplane across two chassis slots.
- Inputs interface with totem pole, open collector, or differential encoder drivers.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module into two adjacent slots of an Allen-Bradley 1771 chassis.
- Position keying bands between pins 2 and 4, and pins 26 and 28.
- Tighten terminal screws on the 1771-WG wiring arm to 9 pound-inches.
- Maintain ambient operating temperatures between 32 and 140 degrees Fahrenheit.
TECHNICAL INFORMATION
Configuration Guidelines
- Exchange position and control data with the controller using block transfer instructions.
- Select encoder formats using BCD, natural binary, or standard Gray code settings.
- Configure rotation direction for Gray code encoders to match machine travel.
- Enter preset position values to actuate the eight high-current outputs.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley 1771 I/O chassis assemblies.
- Operates with PLC-5 programmable controllers supporting block transfer instructions.
- Requires the Allen-Bradley 1771-WG wiring arm for field terminations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley 1771 I/O chassis assemblies. Operates with PLC-5 programmable controllers supporting block transfer instructions. Requires the Allen-Bradley 1771-WG wiring arm 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
What input signals does the Allen-Bradley 1771-DE module accept?
The module accepts 5V DC 12-bit absolute encoder inputs. It supports BCD, natural binary, and standard Gray code formats.
How many slots does the 1771-DE require in a chassis?
The 1771-DE module occupies two adjacent slots in a standard 1771 I/O chassis.
What is the output capacity of the 1771-DE module?
It provides eight sourcing outputs at 5 to 24V DC. Each channel handles 2.0 A continuous current.
What is the market reference price for the 1771-DE?
Observed market reference pricing is approximately $768 USD for refurbished units. Pricing is indicative only and not a final quotation.
