5: SPECIAL FUNCTIONS
« FC4A MICROSMART USER’S MANUAL » 5-15
Example: Two-phase High-speed Counter for Counting Input Pulses from Rotary Encoder
This example demonstrates a program for two-phase high-speed counter HSC1 to punch holes in a paper tape at regular
intervals.
Description of Operation
A rotary encoder is linked to the tape feed roller directly, and
the output pulses from the rotary encoder are counted by the
two-phase high-speed counter in the MicroSmart CPU module.
When the high-speed counter counts 2,700 pulses, the compar-
ison output is turned on. When the comparison output is turned
on, the high-speed counter continues another cycle of counting.
The comparison output remains on for 0.5 second to punch
holes in the tape, and is turned off before the high-speed
counter counts 2,700 pulses again.
Program Parameters
Note: This example does not use the phase Z signal (input I2).
Programming WindLDR
Group 1 (I0 - I2) Two/Single-phase High-speed Counter
High-speed Counter Settings Two-phase High-speed Counter
Enable Comparison Yes
Comparison Output Q1
Use HSC Reset Input (I2) No
HSC Reset Value (D8046)
To cause current value over flow every 2700 pulses, store 62836 to D8046
(65535 – 2700 + 1 = 62836)
Timer Preset Value 0.5 sec (needed for punching) programmed in TIM instruction
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