Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 120

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 121 Input assignment-wise / maximum
frequency for high-speed counters.
Counter type
1 phase, 1 input counter (S/W)
1 phase, 1 input counter (H/W)
1 phase, 2 input counter
2 phase, 2 input counter [1 edge count]
2 phase, 2 input counter [2 edge count]
2 phase, 2 input counter [4 edge count]
Internal clock
Precautions
• The input circuit has restrictions for maximum frequency.
FX5U-32M, FX5UC-32M
X0 to X5
X6 to X17
*1 : Head input number for each high-speed pulse input/output module
• 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
■CPU module
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 inputcomparison 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.
■High-speed pulse input/output module
The matched output from the high-speed comparison table is possible only in the same module.
The time from pulse inputcomparison of count value (match)output to Y is 5 s + the input response time.
■Operation diagram
An operation diagram is shown below. (Comparison value: 5)
ON
Pulse input
OFF
ON
Output (Y)
OFF
Count range
-2147483648 to +2147483647. These are signed 32-bit ring counters.
Ring length setting is however in the range of 0 to 2147483647.
19 HIGH-SPEED INPUT/OUTPUT FUNCTION
118
19.1 High-speed Counter Function
FX5U-64M, FX5U-80M,
FX5UC-64M, FX5UC-96M
X0 to X7
X10 to X17
5s + the input
response time
Maximum frequency
200 KHz
200 KHz
200 KHz
200 KHz
100 KHz
50 KHz
1 MHz (fixed)
High-speed pulse input/output
*1
module
X to X+5
X+6, X+7
Maximum frequency
200 KHz
10 KHz