Mitsubishi Electric MELSEC iQ-F FX5 - Page 240

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25 HIGH-SPEED INPUT/OUTPUT FUNCTION
25.1 High-speed Counter Function
■Internal clock
Counting method of internal clock is as follows.
Under ordinary circumstances, the internal clock counts up/down by 1 MHz clock. External input is not used.
High-speed counter form
High-speed counter form becomes ring counter depending on the ring length setting.
■When ring length is set
■When ring length is not set (ring counter)
Maximum frequency
The maximum frequency that each type of counter can count is as follows.
For details concerning maximum frequency by input assignment, refer to Page 242 Input assignment-wise / maximum
frequency for high-speed counters.
■FX5S/FX5UJ CPU module
Counter type Maximum frequency
1 phase, 1 input counter (S/W) 100 kHz
1 phase, 1 input counter (H/W) 100 kHz
1 phase, 2 input counter 100 kHz
2 phase, 2 input counter [1 edge count] 100 kHz
2 phase, 2 input counter [2 edge count] 50 kHz
2 phase, 2 input counter [4 edge count] 25 kHz
Internal clock 1 MHz (fixed)
ON
ON
OFF
OFF
Current value
Up counting Down counting
Internal clock (1 MHz)
Count direction switching bit
21474836470 1 2147483646
Up counting
Down counting
+2147483647-2147483648 -2147483647 +2147483646-1 0 +1
Up counting
Down counting