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19 BUILT-IN I/O FUNCTION
19.1 High-speed Counter Function
Precautions
• The input circuit of the CPU module has restrictions for maximum frequency
• If input response time is set, maximum frequency is affected by the setting value.
• Under ordinary circumstances, the internal clock counts at 1 MHz (fixed) during operation.
Matched output performance
If output is to Y0 to Y17 using high-speed comparison instructions (DHSCS, DHSCR, DHSZ instruction), high-speed
comparison table, or multiple point output high-speed comparison table, time from pulse inputcomparison of count value
(match)output to Y is 5 s + input response time.
If output is to Y20 or subsequent, time from pulse input to output is affected by communication and user interrupt.
Count range
-2147483648 to +2147483647. These are signed 32-bit ring counters.
Ring length setting is however in the range of 0 to 2147483647.
FX5U-32M, FX5UC-32M FX5U-64M, FX5U-80M Maximum frequency
X0 to X5 X0 to X7 200 KHz
X6 to X17 X10 to X17 10 KHz