Allen-Bradley 1771-DS
Allen-Bradley 1771-DS
Allen-Bradley 1771-DS
Allen-Bradley 1771-DS
Allen-Bradley 1771-DS
Allen-Bradley 1771-DS
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    Discontinued / Obsolete by OEM
    Apter Power delivers tested Allen Bradley PLC-5 components to maintain stable, continuous operation across mature processing lines.

1771-DS

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The Allen-Bradley 1771-DS latching input module is ideal for applications requiring precise timing and fast response.
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Technical specifications for 1771-DS

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-DS
  • Product Family:
    PLC-5
  • Product Type:
    Latching Input Module
  • Stock:
    1
  • Inputs:
    8
  • Module Location:
    1771 I/O chassis
  • Pulse Capture Time:
    0.1, 0.5, 1.0, 2.5, or 5.0ms
  • Input Voltage Range:
    10 to 27V DC for a logic 1, 0 to 4V DC for a logic 0
  • Reverse Voltage Protection:
    240V DC max
  • Maximum Off-State Current:
    1mA @ 4V DC
  • Nominal Input Current:
    20mA @ 27V DC typical
  • Weight:
    0.4 kg
  • Estimated shipping dimensions:
    3x15.2x26cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Applications Communication & Connectivity Safety & Compliance

Features:

  • Interface Between Optical Sensors and PLC-5 Control System
  • Combines Capability of High-Speed Pulse Detection with Latching Input Support
  • Operates in Conjunction with Optical Sensors and Standard 1771 I/O Chassis
The 1771-DS operates as the Latching (10-27V DC) Input Module in a 1771 I/O chassis, providing reliable detection of high-speed pulse signals to the PLC-5 control system. It continuously monitors input terminals for pulses ranging from 0.1 to 5.0 milliseconds in duration and sets corresponding bits in the input image table address during the next I/O scan cycle. Seamless pulse capture is standard with the 1771-DS, however using the Paired Input Configuration will allow coordinated response between gate signals and pulse events for enhanced application flexibility. The 1771-DS has made improvements in several areas over previous input module designs in addition to incorporating latching capability within the 1771 I/O system.

The 1771-DS provides essential input functions common to the entire control system, and is a critical component of the monitoring path, directly affecting the proper, normal operation of high-speed counting and positioning applications. One or more 1771-DS modules are required per chassis depending on the number of pulse inputs needed. The 1771-DS occupies a standard single slot in the 1771 I/O chassis and can be located in any available I/O slot position.

For Paired Input applications, the 1771-DS requires configuration of two inputs working in coordination. In addition to standard independent operation, the paired configuration also performs synchronized signal processing. The 1771-DS paired input configuration executes coordinated detection using the internal circuitry specified in the module specifications. Using this method, the paired input system continually monitors both the gate signal and pulse input. If the 1771-DS detects that the gate signal is active and a pulse event occurs, it will automatically process both signals accordingly and update the input image table for the PLC-5 processor.

The 1771-DS Allen-Bradley Latching Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1771-DS Latching Input Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1771-DS Latching Input Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1771-DS
  • Condition New Original ready stock
  • Product Family 1771-OFE,1771-WV,1771-DV
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • High-Speed Pulse Detection: It can detect and latch pulses with a duration as short as 0.1 to 5.0 ms.
  • Optical Sensor Integration: Frequently used with optical sensors that have isolated pulse or gate outputs.
  • Manufacturing Automation: Ideal for processes requiring precise monitoring of rapid events that occur between standard I/O scans, such as part detection on high-speed assembly lines.
  • PLC Compatibility: It is compatible with Allen-Bradley programmable controllers that support the 1771 I/O structure and block transfer capabilities.
  • I/O Scanning: When a pulse is detected, the module sets a bit in the corresponding input image table address, which the PLC processor then reads during its next I/O scan.
  • Voltage Range: Operates within a 10–27V DC range, allowing it to interface with a wide variety of industrial DC devices.
  • Field Wiring: Connections are made via a dedicated field wiring arm (typically 1771-WN or similar), which allows for module replacement without disconnecting individual wires.
  • Environmental Protection: The module is classified as open-style equipment and must be installed in a suitable enclosure to meet safety requirements.
  • Electrical Isolation: Features opto-electrical isolation to protect backplane and logic circuits from electrical transients and noise.
  • Hot-Swapping Warning: Power must be removed from the I/O chassis before inserting or removing the module to prevent electrical arcing or equipment damage.
  • ESD Sensitivity: The unit is sensitive to electrostatic discharge; users should use grounding wrist straps and follow ESD handling guidelines.
  • Directives: Older versions were tested to meet Council Directive 73/23/EEC (Low Voltage) and safety requirements of EN 61131-2.
Description
The Allen-Bradley 1771-DS Latching (10-27V DC) Input Module is a specialized industrial control component designed to detect and latch high-speed pulse signals in demanding manufacturing environments. The 1771-DS module captures pulses ranging from 0.1 to 5.0 milliseconds in duration, making it ideal for applications requiring precise timing and rapid response. When the 1771-DS detects a pulse at any input terminal, it immediately sets a corresponding bit in the input image table address during the next I/O scan cycle, ensuring no critical pulse events are missed in fast-paced production processes.

The Allen-Bradley 1771-DS is specifically engineered to interface with optical sensors commonly used in automated material handling, high-speed counting systems, and precision positioning applications. The 1771-DS supports optical sensors featuring both isolated pulse outputs and isolated gate outputs, providing flexibility for various sensor configurations in industrial automation setups. For optimal performance with the 1771-DS, the off-state leakage current of connected optical sensors must not exceed 1mA at 4V DC, ensuring reliable signal detection without false triggering.

The Allen-Bradley 1771-DS offers versatile input operation modes to accommodate different application requirements. In Independent mode, each input on the 1771-DS functions autonomously, allowing simultaneous monitoring of multiple discrete pulse sources without interference. Alternatively, the 1771-DS can operate in Paired mode, where one input responds to a continuous gate signal while the other input captures discrete pulse events—this configuration is particularly valuable for synchronized motion control and gated counting applications where timing correlation between signals is essential.
Revisions

Revision Part #

Also known as

1771-DS Ser A
1771-DS/A, Series A, Rev A
1771-DS Ser B
1771-DS/B, Series B, Rev B
Alternative Names
1771DS 177I-DS 177IDS I771-DS I771DS I77I-DS
Technical notes
The Allen-Bradley 1771-DS is a legacy 8-point digital latching input module designed for the Bulletin 1771 PLC-5 I/O platform that specializes in capturing and retaining exceptionally brief high-speed electrical pulses ranging from 0.1 to 5.0 milliseconds in duration, ensuring that rapid events—such as components passing a sensor—are reliably registered by the central processor during its standard I/O scan.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the Allen-Bradley 1771-DS input module?
The Allen-Bradley 1771-DS is a latching DC input module designed to detect and capture high-speed pulse signals in industrial automation systems, ensuring critical events are not missed.
What type of signals can the 1771-DS detect?
The module is capable of detecting pulse signals with durations ranging from 0.1 to 5.0 milliseconds, making it ideal for high-speed and precision applications.
How does the latching function work in the 1771-DS?
When a pulse is detected at any input terminal, the module latches the event by setting a corresponding bit in the input image table during the next I/O scan cycle, ensuring accurate capture of fast signals.
What are the typical applications of the 1771-DS?
It is commonly used in automated material handling systems, high-speed counting, and precision positioning applications where accurate pulse detection is essential.

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