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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.
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Related Manuals for Allen-Bradley 1771-IB
Summary of Contents for Allen-Bradley 1771-IB
- Page 1 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...
- Page 2 The dc input module is shipped in a static–shielded bag to guard against electrostatic discharge damage. Observe the following precautions when handling the module. ATTENTION: Under some conditions, electrostatic discharge can degrade performance or damage the module. Observe the following precautions to guard against electrostatic damage. Wear an approved wrist strap grounding device, or touch a grounded object to discharge yourself before handling the module.
- Page 3 To install the dc input module in your 1771 Series B I/O chassis, follow the steps listed below. ATTENTION: Remove power from the 1771 I/O chassis backplane and wiring arm before removing or installing an I/O module. Failure to remove power from the backplane or wiring arm could cause module damage, degradation of performance, or injury.
- Page 4 Connect one terminal of your 2 or 3–wire input device to terminals 0 through 7 (Figure 1). Connect 3–wire input devices, such as Allen–Bradley proximity switches (Bulletin 871) to operate in a current source mode (Figure Connect terminal B to the dc common. Terminal A is not used. Connect the +dc line to the other terminal of your input devices.
- Page 5 The front panel of your module contains 8 red status LED indicators (figure 3). The red status indicators are provided for system logic side indication of individual inputs. When a red LED lights, voltage is present on the terminal. The module transfers this information to the backplane for the processor to read.
- Page 6 As a subsidiary of Rockwell International, one of the world’s largest technology companies — Allen-Bradley meets today’s challenges of industrial automation with over 85 years of practical plant-floor experience. More than 11,000 employees throughout the world design, manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality, productivity and time to market.
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