PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-DL is a Gray code converter module for PLC-5 systems. It accepts position inputs from an 8-bit absolute Gray code encoder. The module converts incoming Gray code values into an 8-bit binary representation. This binary data transfers across the I/O chassis backplane to the programmable controller. An external 12 to 24V DC power supply powers the connected encoder.
This single-slot module includes an onboard 120V AC zero-speed triac switch. The triac switch conducts while the encoder shaft remains in motion. It turns off after rotation stops following an adjustable time delay. Users adjust the delay between 0.3 and 6 seconds using a front-panel trim potentiometer. The switch acts as a safety interlock by opening the drive circuit upon stopping.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current | 0.12 Amperes |
|---|
| Category | PLCs |
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| Coating | Conformal Coat |
|---|
| Inputs | 12-24 Volt DC 8-Bit Absolute Encoder (Gray Code Format) |
|---|
| Max Input Frequency | 1 Kilohertz |
|---|
| Module Type | Positioning I/O Module |
|---|
| Module Update Period | 1 Milisecond |
|---|
| Outputs | 120 Volts AC 0.5 Ampere Continuous Zero Speed Switch |
|---|
| Product Line | PLC 5 |
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| Slots | 1 Slot |
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| UPC | 662468205412 |
|---|
| Weight | 0.94 lbs (0.43 kg) |
|---|
| Wiring Arm | 1771-WB |
|---|
TECHNICAL INFORMATION
Features
- Accepts position signals from 8-bit absolute encoders tracking 0 to 360 degrees.
- Converts 8-bit Gray code patterns into binary values from 0 to 255.
- Provides an onboard 120V AC zero-speed triac switch rated at 0.5A continuous.
- Features an adjustable zero-speed off-delay between 0.3 and 6 seconds.
- Delivers a 1 millisecond module update period and input filter response.
- Includes circuit board conformal coating for environmental protection.
TECHNICAL INFORMATION
Applications
- Absolute rotary position tracking from 0 to 360 degrees.
- Zero-speed motion detection in drive systems.
- Safety interlock control to open drive circuits upon motion stoppage.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects field wiring using the 1771-WB wiring arm.
- Requires external 12 to 24V DC power between the wiring arm and encoder.
- Accepts multi-conductor cabling from the absolute Gray code encoder.
- Provides terminal connections for the 120V AC zero-speed triac circuit.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module into one slot of a 1771 I/O chassis.
- Place plastic keying bands between pins 4 and 6 and pins 24 and 26.
- Terminate field connections on the 1771-WB wiring arm before seating.
TECHNICAL INFORMATION
Configuration Guidelines
- Turn the front trim potentiometer clockwise to increase the zero-speed time delay.
- Turn the trim potentiometer counter-clockwise to decrease delay down to 0.3 seconds.
- Configure PLC-5 backplane input data polling for 8-bit binary values.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley PLC-5 1771 I/O chassis.
- Allen-Bradley Bulletin 845A-SJZ3DN6DW 8-bit Gray code absolute encoder.
- Allen-Bradley 1771-WB field wiring arm.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley PLC-5 1771 I/O chassis. Allen-Bradley Bulletin 845A-SJZ3DN6DW 8-bit Gray code absolute encoder. Allen-Bradley 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-DL module?
It converts 8-bit absolute Gray code encoder signals into 8-bit binary data for PLC-5 processors.
Which wiring arm is compatible with the 1771-DL module?
The module requires an Allen-Bradley 1771-WB wiring arm for field terminations.
How does the zero-speed switch function on the 1771-DL?
The triac switch conducts during shaft rotation and opens after motion stops following a preset delay.
What is the market reference price for the 1771-DL module?
Observed market reference pricing is approximately $349.00 USD. This figure is an indicative reference price, not a final quotation.
