High-Speed Counter Function; Overview Of High-Speed Counter Function - Panasonic GM1 User Manual

12.6 High-speed Counter Function

12.6 High-speed Counter Function

12.6.1 Overview of High-speed Counter Function

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Two 4-MHz, signed 32-bit high-speed counters are provided
● High-speed counting of input signals is available for up to the maximum frequency 4 MHz (or
16 MHz for 2-phase input 4 multiple). Two-phase input (phase differential input), individual
input, or direction identification input can be selected according to the input device such as
encoders or sensors.
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24 VDC, 12 VDC, and 5 VDC inputs and line driver input are supported
● The count input circuit supports both open collector output and line driver output (differential
output: equivalent to AM26LS31).
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Ring counter or linear counter can be selected
● Both the ring counter and linear counter are supported. Both types can use the Z-phase of
an encoder as count reset timing.
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Internal clock counting is possible
● Internal clocks can be selected as count input signals. High-accuracy time measurements
can be made with a maximum resolution of 0.25 µs. Selectable internal clocks are 0.25 µs (4
MHz), 1 µs (1 MHz), 10 µs (100 kHz), and 100 µs (10 kHz).
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Capture function and sampling capture function are provided
● It is possible to store the count value at the moment of the occurrence of a trigger assigned
to a capture flag. Count values can be checked, independently of I/O refresh.
● The capture function executes capturing at the rising and falling edges of a capture flag. The
sampling capture function executes capturing at every sampling time according to the input
of a capture flag.
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Various counter operations can be selected
1. Enable count operation
2. Reset count operation
3. Preset count operation
4. Enable reset count operation
5. Enable preset count operation
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Band comparison function and target value match comparison function are
provided
● The band comparison function allows up to 16 pairs of upper and lower limits to be set for
each counter. Up to 16 comparison match flags can be turned ON or OFF for each
comparison condition.
● The target value match comparison function allows up to16 target values to be set for each
counter. Target values can be set or reset individually according to the direction of counting
(incrementation or decrementation) when the count value reaches the target value or when
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