• Allen-Bradley 1771-DS
  • Allen-Bradley 1771-DS
  • Allen-Bradley 1771-DS
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Allen-Bradley 1771-DS PLC-5 Latching Input Module

Allen-Bradley 1771-DS PLC-5 Latching Input Module

The Allen-Bradley 1771-DS is a specialized 8-input Latching Input Module designed for the PLC-5 system. It is engineered to detect and latch high-speed pulses that occur too rapidly for a...

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SKU: 1771-DS
Vendor: Allen-Bradley
Category: PLC I/O Module
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The Allen-Bradley 1771-DS is a specialized 8-input Latching Input Module designed for the PLC-5 system. It is engineered to detect and latch high-speed pulses that occur too rapidly for a standard PLC-5 scan rate to capture. When a pulse is detected at an input terminal, the module sets a corresponding bit in the input image table during the next I/O scan.

Features

  • 8-input latching capability for high-speed signal capture.
  • Selectable pulse capture times: 0.1, 0.5, 1.0, 2.5, or 5.0 ms.
  • Opto-electrical isolation of 1500V for signal integrity.
  • Supports both master reset (all inputs) and individual input reset modes.
  • Compatible with sensors featuring isolated pulse or gate outputs.

Applications

  • High-speed signal capture for processes exceeding standard PLC-5 scan rates.
  • Material handling systems requiring precise position or product presence detection.
  • Packaging equipment and pick-and-place machinery.
  • Custom machine tool manufacturing and textile assembly lines.

Technical Specifications

Model 1771-DS
Inputs 8
Input Voltage (Logic 1) 10 to 27V DC
Input Voltage (Logic 0) 0 to 5V DC
Nominal Input Current 20mA @ 27V DC
Max Off-State Current 1mA @ 4V DC
Backplane Current 375mA typical
Isolation 1500V Opto-electrical
Operating Temperature 0 to 60 degC

Installation Guidelines

  • Slot Placement: The module can be installed in any I/O slot of a 1771 chassis, excluding the far-left slot reserved for the processor or adapter.
  • Keying: To prevent incorrect module insertion, install keying bands on the backplane connector between pins 2 and 4, and between pins 18 and 20.
  • Wiring: Connect field wiring to the appropriate field wiring arm (e.g., 1771-WH) before seating the module into the chassis.
  • Handling: Always power down the I/O chassis before inserting or removing the module to prevent electrical damage or unexpected system behavior.

FAQs

What is the 1771-DS Module?

The 1771-DS is a Latching Input Module designed by Allen-Bradley for the PLC-5 system. It is an 8-input, rack-mountable module that operates within a 1771 I/O chassis, commonly used to capture fast pulses.

What are the input voltage levels?

Logic 1 is 10-27V DC, and Logic 0 is 0-5V DC.

What sensors are compatible?

It is designed for optical sensors with isolated pulse or gate outputs. The off-state leakage current of the sensors must not exceed 1mA @ 4V DC.

What is the modern replacement?

When upgrading from PLC-5 to ControlLogix (1756), users often replace it with high-speed modules like the 1756-IB16IF (Fast DC Input) or the 1756-IB16ISOE (Sequence of Events) to maintain fast response times.