Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 13)

1 Publication 1746-UM006B-EN-P - August 2005
Chapter
1
Module Overview
This chapter contains the following:
•
high-speed counter module overview
•
operating modes
•
hardware features
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. The high-speed module 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 to providing an Accumulated Counter, the module
provides a Rate Counter to determine Rate Measurement by indicating
the pulse input frequency in Hz. (Refer to the block diagram on the
following page.) 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 from one of two sources:
•
the user program
•
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.