Rockwell-automation 1734-IK Encoder/Counter Modules User Manual Manuel d'utilisateur Page 11

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1 Publication 1734-UM006B-EN-P - August 2005
Chapter
1
About the Modules
What This Chapter Contains
Read this chapter to learn about types, features, and capabilities of
encoder/counter modules.
Module Description and
Features
Encoder/counter modules install into the Point I/O terminal base
(1734-TB or 1734-TBS) and interface with the Point I/O DeviceNet
Pass-through (1734-PDN) or the Point I/O DeviceNet Adapter
(1734-ADN).
An encoder/counter module serves as a signal conditioner, function
block, and counter between the customer process signals on the
terminal base and the POINTBus containing the command
information. The main functional blocks are the the following.
Customer digital I/O interface
Counter ASIC
Microprocessor
The encoder/counter module accepts feedback from the following.
Encoders (either single-ended or differential)
Pulse generators
Mechanical limit switches
Frequencies up to 1 MHz
A filter is available with the following settings.
50 Hz
500 Hz
5 kHz
50 kHz
Turn the filter off to achieve the fastest counting rate.
The input voltage range is 5V dc (1734-IJ) or 15-24V dc (1734-IK). The
module returns the count or frequency in the form of a 24 bit binary
number (0 - 16,777,215) expressed in a 32 bit long word.
Each counter has a user-selectable preset and rollover value
associated with it.
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