Rockwell Automation 1746-HSCE High-Speed Counter Module Installation Instructions - Manual (Page 5)

High-Speed Counter Module 5
Publication 1746-IN011C-EN-P - April 2005
High-Speed Counter Module Overview
The High-Speed Counter Module, Catalog Number 1746-HSCE is an SLC 500 family
compatible device except with the 1747-ASB Remote I/O Adapter Module. It can be
used with SLC
™ 5/02 (and above) processors.
The module’s bidirectional counting ability allows it to detect movement in either
direction. In addition, x2 and x4 counting modes are provided to fully use the
capabilities of high-resolution quadrature encoders.
High-speed inputs from quadrature encoders and various high-speed switches are
supported. Accepting input pulse frequencies of up to 50k Hz allows precise
control of fast motions.
In addition, an Accumulated Counter, the module provides a Rate Counter to
determine Rate Measurement by indicating the pulse input frequency in Hz. (See
the block diagram on page 6.) The Rate Measurement is determined by
accumulating input pulses over a fixed period of time. You set the Rate Period to
best match your application requirements.
Background Rate calculation is provided in Sequencer and Range Modes. This
operation accepts input rates up to 32,767 Hz. The dynamically configurable Rate
Period ranges from 10 ms to 2.55 seconds.
The module’s four current sink (open collector) outputs can be controlled in the
user program or the module.
Control of the counter reset is configured through user-set parameters. The counter
can be reset from any combination of the Z input, Limit Switch input, or Soft Reset
control bits.
Module operation is determined by selections made in the Setup and Control Word
(M0:e.1). Setting the Function Control bit to 1 triggers the module to start the
proper pulse counter, rate measurement, and output control functions. Many
parameters are dynamic and can be changed without disrupting counter operation.
The module’s block diagram is shown on page 6. Inputs from the terminal block
enter the diagram at the left, outputs to the terminal block exit at the right. M0 and
Output file parameters from the SLC enter the logic blocks from the top. Input file
data to the SLC exit the logic blocks from the bottom.