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Installation Instructions
This document provides information on:
important pre-installation considerations
power supply requirements
initial handling
installing the module
using the indicators for troubleshooting
module specifications
You can use this module in a Series A or B 1771-A1B, -A2B, -A3B,
-A3B1, and -A4B chassis. The module is also compatible in a 1771-AM1
or -AM2 I/O chassis.
You can use any TTL device that meets the output logic level specification
of -0.2V dc to +0.8V dc (low), and 2.0V dc to 5.25V dc (high).
This module contains input filtering to limit the effects of voltage
transients caused by contact bounce and/or radiated electrical noise.
The delay due to filtering is less than 1ms.
For maximum noise immunity, the output of the TTL device should have a
pull-up resistor of 1k ohm (typical). Add an external pull-up resistor to the
output terminals of the device, if necessary. If you add a pull-up resistor, be
sure the TTL device maintains the low state requirement of -0.2V dc to
+0.8V dc with the increased load.
The TTL module requires power from two sources: the I/O chassis
backplane, and a +5V dc power supply that you provide for transmission of
TTL signals.
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Table of Contents
Related Manuals for Allen-Bradley 1771-IGD
Summary of Contents for Allen-Bradley 1771-IGD
- Page 1 Installation Instructions This document provides information on: important pre-installation considerations power supply requirements initial handling installing the module using the indicators for troubleshooting replacing the fuse module specifications You can use this module in a Series A or B 1771-A1B, -A2B, -A3B, -A3B1, and -A4B chassis.
- Page 2 Backplane The TTL module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The module requires 130mA 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.
- Page 3 You select high-true or low-true using the jumper accessible through a slot at the top of the module. Locate the jumper in the slot at the top edge of the module. Use tweezers to position the jumper as required for your application. Use the plastic keying bands, shipped with each I/O chassis, to key the I/O slots to accept only this type of module.
- Page 4 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 field wiring arm could cause module damage, degradation of performance, or injury. Failure to remove power from the backplane could cause injury or equipment damage due to possible unexpected operation.
- Page 5 Separate the shielded cables from wiring that radiates electrical noise. Refer to category 2, low power dc I/O lines, in publication 1770-4.1, ‘‘Programmable Controller Wiring and Grounding Guidelines”. Prepare the cable for grounding by doing the following: Ground the single strand (at the ground lug end) to the grounding stud on the I/O chassis or by using single-point grounding.
- Page 6 Connect the insulated wires to their respective terminals on the field wiring arm. Input terminals of the TTL input module (cat. no. 1771-IGD) may be directly driven by the outputs of a TTL output module (cat. no. 1771-OGD). Connect the cable shield between modules at one end only.
- Page 7 The front panel of your module contains 18 status indicators (Figure 1). The green top indicator is labeled ‘‘ACTIVE.” This indicator is on when the fuse is good. The green bottom indicator, when on, indicates you selected high-true logic. When off, it indicates you selected low-true logic. Each of the 16 red status indicators light when their corresponding input terminal senses TTL voltages in the true state.
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