Rockwell Automation 1734-VHSC24 Very High-Speed Counter Modules User Manual - Manual (Page 11)

1 Publication 1734-UM003B-EN-P - August 2005
Chapter
1
About the Modules
What This Chapter Contains Read this chapter to learn about types, features, and capabilities of the
encoder/counter modules.
Module Description and
Features The 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).
A 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 following.
• Customer digital I/O interface
• Counter ASIC
• Microprocessor
The 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 5Vdc (VHSC5) or 15-24V dc (VHSC24). 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.
The module has 2 outputs that access customer power from the
POINTBus to facilitate various output device voltage requirements.