Description：

The 1771-DS is a latching module with an input of 10-27V DC. It latches and detects pulses with a duration of 0.1-5.0 ms. Using an input terminal, the module discovers pulses and puts a bit within a corresponding image address table during the next I/O scan. The 1771-DS module responds to pulses by using an optical sensor which has an isolated gate output and an isolated pulse output. This module’s input has two ways to operate. Unless paired, this module operates independently, and when this module is paired, it either responds to a certain pulse or it responds to the gate signal. The pulse that this module can capture is the minimum pulse width. With a pulse capture time of 0.1ms, 0.5ms, 1.0ms, 2.5ms, or 5.0ms, you can select the pulses by measuring the duration of some typical pulses. It is recommended that the usable capture time you select is the shortest in terms of using the paired input. And in each pulse, the 1771-DS requires time to recover and this depends on the time that you selected.

Specification：

Frequently asked questions

Q1: What is the 1771-DS?

A1: The 1771-DS is a latching digital input module used in PLC systems to capture and retain fast input signals, even if they occur briefly.

Q2: How many inputs does it support?

A2: It provides 8 digital input channels.

Q3: What is the 1771-DS input voltage range?

A3: The 1771-DS module operates within 10–27 V DC input voltage.

Q4: How many slots does it occupy?

A4: It requires 1 slot in the PLC chassis.

Q5: What is the 1771-DS backplane current requirement?

A5: It draws approximately 0.375 A from the backplane.

Product Applications

Papermaking industry: Hydraulic positioning or force control for the wet and dry ends of paper machines, precisely monitored by the PLC-5 system using sensor feedback to reduce leakage and lower energy consumption.

Energy and Chemicals: Applied in continuous production processes such as oil and gas, chemical processing, and cement production that require a durable control platform (like PLC-5).

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