High-Speed Counter - IDEC MICROSmart FC6A Series User Manual

High-Speed Counter

This section describes the high-speed counter for counting high-speed pulses from devices such as rotary encoders and proximity
switches. The high-speed counter is a function that counts high-speed pulses with the FC6A Series MICROSmart hardware that
cannot be read in the execution of a normal user program. The high-speed counter has a comparator function to compare the
current value and a preset value (target value). When the current value and the preset value match, an external output is turned
on or an interrupt program is executed.
The high-speed counter has a single-phase high-speed counter and a two-phase high-speed counter.
To use high-speed counters, WindLDR function area settings are required.
■ Application example
This application example punches holes into a roll of paper at a regular interval. The two pulses (A-phase, B-phase) that carry
the phase difference output from the rotary encoder are counted by the FC6A Series MICROSmart two-phase high-speed
counter.
When the current value reaches the preset value, the specified external output turns on and the perforator punches a hole in the
roll of paper.
High-speed counter operation modes
The high-speed counter has the following two operation modes:
Single-phase high-speed counter

Two-phase high-speed counter

High-speed counting modes
The high-speed counter has the following five counting modes:
Adding counter (single-phase high-speed counter)

 Up/down selection reversible counter (single-phase high-speed counter)
Dual-pulse reversible counter (single-phase high-speed counter)

2-edge count (two-phase high-speed counter)

4-edge count (two-phase high-speed counter)

Example: The input allocation when external input group 1 is specified as a two-phase high-speed counter
External input
High-speed counter
Pulse Motor
Rotary
Encoder
FC6A Series MICROSmart
I0 I1
 
A-phase B-phase
FC6A S MICROS
ERIES
Paper Roll
Paper Feed Roller
I2

External reset input (Z-phase)
U ' M FC9Y-B1722
MART SER S ANUAL
5: F
UNCTIONS AND
Perforator
S
ETTINGS
5-15