Rockwell Automation 1746-HSCE2 Multi-Channel High Speed Counter Module - Manual (Page 15)

1 Publication 1746-UM002B-EN-P - August 2004
Chapter
1
Module Overview
This chapter contains the following:
• multi-channel high-speed counter module overview
• operating class
• hardware features
Multi-Channel High-Speed
Counter Module Overview The 1746-HSCE2 is an intelligent counter module with its own
microprocessor and I/O that is capable of reacting to high-speed input
signals without the intervention of the SLC processor. The module is
compatible with the SLC 500 family and can be used in a remote
chassis with the SLC Remote I/O Adapter Module (1747-ASB).
Counters
The module is able to count in either direction. A maximum of four
pulse counters are available (or 2 quadrature counters). Each counter
can count to +/- 8,388,607 as a ring or linear counter. In addition to
providing a count value, the module provides a rate value up to
+/-1 MHz, dependent on the type of input. The rate value is the input
frequency (in Hertz) to the counter. When the count value is
increasing, the rate value is positive. When the count value is
decreasing, the rate value is negative.
Counters can also be preset to any value between the minimum and
maximum values. The conditions that preset the count value and
generate capture values are configured by the gate/preset modes. The
four counters can have different gate/preset modes.