Rockwell Automation 1757-PIM User Manual
Installation Instructions
ProcessLogix Pulse Input Module
Catalog no. 1757-PIM
This document tells you how to install the 1757-PIM (Pulse Input Module) into the
ProcessLogix™ System. For more specific information regarding the placement of
the 1757-PIM in non-redundant and redundant configurations, refer to the
ProcessLogix System Planning Guide in Knowledge Builder.
What is the Pulse Input Module?
The 1757-PIM (Pulse Input Module) is a new addition to the ProcessLogix Rack
I/O family.
The 1757-PIM is a single-wide I/O module that serves as the interface board
between the ProcessLogix controller and field transducers that provide pulse inputs.
Typically the 1757-PIM might be used to accept pulse inputs from:
• tachometers, to determine required speeds of rotation for motors, fans and
pumps
• flowmeters, to determine totalized process flows such as inputs to batch
dosing operations
The 1757-PIM provides up to eight input channels and two output channels. Each
of the eight channels has a 32-bit counter to perform pulse counting and frequency
calculation for signals up to 100 KHz. Six of the eight channels also have a second
32-bit timer counter for pulse period and pulse width measurements. The
remaining channels provide pulse counting and frequency calculations and have
associated outputs that can be used for fast cut-off applications. The 1757-PIM
provides channel-to-channel and terminal-to-backplane isolation.
The 1757-PIM uses the standard 36-pin terminal block and interfaces directly to
single-ended devices. The threshold level for each channel is software configurable
and selections are either LOW (approx. 3.25V typical) or HIGH (approx. 8.80V
typical) for a high-level voltage level. The 1757-PIM interfaces directly to 5 to 24V
signal values.
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2 ProcessLogix Pulse Input Module
ATTENTION
!
Important User Information
Because of the variety of uses for the products described in this publication, those
responsible for the application and use of this control equipment must satisfy
themselves that all necessary steps have been taken to assure that each application
and use meets all performance and safety requirements, including any applicable
laws, regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown in this guide
are intended solely for purposes of example. Since there are many variables and
requirements associated with any particular installation, Allen-Bradley does not
assume responsibility or liability (to include intellectual property liability) for actual
use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application, Installation
and Maintenance of Solid-State Control (available from your local Allen-Bradley
office), describes some important differences between solid-state equipment and
electromechanical devices that should be taken into consideration when applying
products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or part,
without written permission of Rockwell Automation, is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
Identifies information about practices or circumstances that can
lead to personal injury or death, property damage or economic
loss
Attention statements help you to:
• identify a hazard
• avoid a hazard
• recognize the consequences
IMPORTANT
Allen-Bradley is a trademark of Rockwell Automation
Publication 1757-IN900A-US-P - February 2000
Identifies information that is critical for successful application
and understanding of the product.
ProcessLogix Pulse Input Module 3
ATTENTION
!
Installing the Module
Follow the procedure below to install the module.
Making Field Wiring Connections
Refer to the following pinout/wiring diagram to wire the module.
This input module permits the field-side input device (switch)
to be located on either the hot or neutral side of the source,
unless the module’s shorting bar has been installed. In this
case, the input device must be installed on the hot side of the
source.
Figure 1 Pinouts and Wiring Example
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This diagram illustrates how the eight transmitters will interface to the 36 Positions Terminal Block.
For instance, Transmitter 0 will be connected to Pins 1, 3 and 5 where:
Pin 1 is the Signal
•
Pin 3 is the Signal Common
•
Pin 5 is the Chassis Ground Shield Connection
•
The Output Channel 0 will connect to Pins 33 and 35 and Output Channel 1 will connect to Pins 34
and 36.
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4 ProcessLogix Pulse Input Module
Installing the Module in the Chassis
Position the module at any slot in the chassis except for slot 0.
Align the module’s circuit board with the top and bottom chassis guides.
Slide the module into the chassis until the module tabs click into position
Configuring the Module
You can customize the 1757-PIM by changing its name, description, slot location,
MAC address, as well as Module, Channel, Status/Data and Server configuration
parameters. Perform the following steps to customize the 1757-PIM.
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ProcessLogix Pulse Input Module 5
Access Control Builder.
Add a new 1757-PIM from the library.
a. Open the Library and Project tree views.
b. In the Library tree view, click on the 1757-PIM icon and drag it to the
Project tree window.
Right-click on the desired IOM instance on the Project tree window.
Click on Configure Param. You see the Main, Module Configuration, Channel
Configuration, Status/Data and Server Parameters configuration tabs.
Under the Main tab (see figure below), enter a Module Name that is more
meaningful to you than its default IOMxxx (xxx represents a pre-assigned
number).
Publication 1757-IN900A-US-P - February 2000
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