Allen-Bradley 1771 ID16 Isolated Input Module Installation Data

Below you will find brief information for Isolated Input Module 1771 ID16. This module is designed to operate with limit switches, float switches, selector switches, and pushbutton switches. The module must be used in a series B I/O chassis. The module contains customer-selectable input filtering to limit the effects of voltage transients caused by contact bounce and/or radiated electrical noise. The delay due to filtering is 9.0 or 18.0ms for turning ac inputs on to off, and 1.0ms for turning ac inputs off to on; 9.0ms for turning dc inputs on to off, and 1.2ms for turning dc inputs off to on. The filter time is factory set to 9.0ms.

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Allen-Bradley Isolated Input Module 1771 ID16 Installation Data | Manualzz

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Key features

  • 16 Inputs
  • Customer-selectable input filtering
  • Operates with limit switches, float switches, selector switches, and pushbutton switches
  • Compatible with 1771-A1B thru -A4B I/O chassis
  • Operates with 74-138V ac, 47-63Hz; 105-138V dc

Frequently asked questions

This module is designed to isolate and filter input signals from various types of switches, such as limit switches, float switches, selector switches, and pushbutton switches. It is intended for use in industrial control systems, where it helps to protect the PLC from noise and transients.

There are two jumpers on the module's circuit board that allow you to adjust the input filter time. The jumpers control the filter time for turning AC inputs on to off. The OFF to ON filter time is fixed at 1ms.

The 'Fast' setting provides a shorter filter time of 9.0ms for AC inputs, while the 'Norm' setting provides a longer filter time of 18.0ms. The choice of setting depends on the application and the level of noise immunity required. In general, the 'Norm' setting is recommended if half-cycle dropout protection is required.
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