DC (12-24V) Input Module
Cat. No. 1771-IB
Installation Data
This document provides information on:
important pre–installation considerations
power supply requirements
initial handling procedures
installing the module
using the indicators for troubleshooting
module specifications
The 1771–IB module is compatible with the following 2 and 3–wire
devices:
DC proximity switches
photoelectric sensors
pushbuttons
limit switches
float switches
selector switches
The off–state leakage current of your 3–wire devices should not exceed
3mA.
This module contains input filtering to limit the effect of voltage transients
caused by contact bounce and/or radiated electrical noise. The delay due to
input filtering is nominally 12+7ms for turning inputs on, and 20+7ms for
turning inputs off.
Your module receives its power through the 1771 I/O chassis backplane
from the chassis power supply. The module requires 74mA from the output
of this supply. Add this to the requirements of all other modules in the I/O
chassis to prevent overloading the chassis backplane and/or backplane
power supply.
To The Installer
Pre-installation Considerations
Power Requirements
