PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-DS is a PLC-5 digital input module designed for pulse detection and latching. It features eight digital input channels operating within an input voltage range of 10 to 27V DC. The unit detects input pulses with durations between 0.1 and 5.0 milliseconds. Latched bits transfer to the corresponding controller image table during the subsequent I/O scan cycle.
The module captures rapid signal transitions using optical sensors equipped with isolated gate and pulse outputs. Inputs can operate independently or in paired mode responding to designated pulses or gate signals. Latched inputs support reset operations through either a master reset or individual channel reset routines. Hardware keying bands protect the single-slot module from incorrect installation in 1771 I/O chassis backplanes.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Backplane Current | 0.375 Amperes |
|---|
| Category | PLCs |
|---|
| Input Voltage Range | 10-27 Volts DC |
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| Module Type | Specialized I/O Module |
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| Number of Inputs | 8 Digital Inputs |
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| Number of Outputs | 0 |
|---|
| Product Line | PLC 5 |
|---|
| Pulse Capture Time | 50-9.999 Microseconds |
|---|
| Slots | 1 Slot |
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| UPC | 612598001729 |
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| Weight | 1.06 lbs (0.48 kg) |
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| Wiring Arm | 1771-WF |
|---|
TECHNICAL INFORMATION
Features
- Provides eight latching digital inputs for 10 to 27V DC signal circuits.
- Offers selectable pulse capture durations of 0.1, 0.5, 1.0, 2.5, and 5.0 milliseconds.
- Supports independent input operation or paired input gating configurations.
- Features dual reset modes supporting master reset or individual input reset commands.
- Includes reverse voltage protection rated up to 240V DC.
- Connects to field wiring using the 1771-WF wiring arm.
TECHNICAL INFORMATION
Connections / Interfaces
- Field connections terminate directly at the 1771-WF wiring arm.
- Connects to the PLC-5 backplane using a standard 1771 edge connector.
- Draws 0.375 amperes of backplane current from the chassis power supply.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module into any single slot of a compatible 1771 I/O chassis.
- Insert keying bands between backplane connector pins 2 and 4.
- Position additional keying bands between pins 18 and 20 to prevent improper insertion.
- Configure module jumper plugs in matching pairs prior to slot insertion.
- Ensure ambient operating temperatures remain between 0 and 60 degrees Celsius.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley PLC-5 system 1771 I/O chassis.
- Requires a 1771-WF wiring arm for field terminal connections.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley PLC-5 system 1771 I/O chassis. Requires a 1771-WF wiring arm for field terminal connections.
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-DS?
The 1771-DS detects and latches high-speed DC pulses as short as 0.1 milliseconds for PLC-5 systems.
What wiring arm is required for the 1771-DS module?
The module uses the Allen-Bradley 1771-WF wiring arm for field wiring connections.
Where should backplane keying bands be installed for the 1771-DS?
Place keying bands between connector pins 2 and 4, and between pins 18 and 20.
What is the reference market price for the 1771-DS module?
Observed market reference pricing is approximately $189.00 USD for refurbished units. These figures are indicative market reference pricing only and are not a final quotation.
