Nematron Pointe Controller - Manual (Page 266)

Appendix A: OptiLogic Technical Specifications Pointe Controller User Guide
264
A.10 OL2258 High Speed Pulse Counter
The OL2258 High Speed Counter Module provides for direct
pulse counting for a variety of high speed pulse interface
applications. Typical applications include motion control,
metering and velocity measurement. The OL2258 contains
on-board intelligence necessary for processing and counting
pulse information as well as automatically triggering control
outputs.
The OL2258 can be configured to operate in one of three
pulse counting modes: Pulse & Direction, Up/Down Count, or
Quadrature. Pulse & Direction and Up/Down Count will
operate at up to 80KHz input pulse rates. Quadrature inputs
count each quadrature state transitions at up to 160 KHz.
Additionally, the OL2258 will return frequency information.
The counter has a 32-bit resolution and a total range of
–2,147,483,648 to +2,147,483,648.
General Overview
The OL2258 is configurable. It can be used with pulse & direction, up/down count
or quadrature type pulse encoders. These signals may come from shaft encoders,
flow meters or any other signal source that produces a pulse train output. When
operating, the OL2258 maintains a current cummulative count as a 32 bit integer
value. It also makes available frequency snapshot data as the most recent count
over either 1 second or 200 milliseconds. The Z and LS inputs can be used to
automatically reset the count to a user defined value. Each transistor output can
be configured to turn on when the count value is within its related count range.
Pulse and Direction
In this configuration, pulses are input to “A”. The counter direction is controlled
by input “B”. The operation is illustrated below.