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.
AB Drives
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