Count Process In Refresh Mode; Maximum Counting Speed Of Counter - Mitsubishi Electric A800 Programming Manual

Counter C
3.10.1

Count process in refresh mode

The counter counts at the rise of the counter's input conditions stored at input refresh.
Ladder example
Counting method
X5 (Image)
C3 coil
C3 present
value
C3 contact
NOTE
• For the maximum counting speed of the counter, refer to
3.10.2

Maximum counting speed of counter

The maximum counting speed of the counter is determined by scan time, and counting is possible only when the ON/OFF
time specified in the input conditions is longer than the scan time.
Maximum counting speed Cmax =
NOTE
• Duty n is a ratio between the ON and OFF time of count input signals and is represented as a percentage (%).
92
Sequence program
Input (X) refresh
OUT
END END
C3
ON
OFF
X5
ON
OFF
ON
OFF
0 1
OFF
When T1 T2 n =
When T1>T2 n =
Count input signal
When OFF to ON of X5 is counted
twice, C3 contact turns ON.
Does not count since X5 remains ON.
OUT OUT
C3 END C3 END
page 92 .
n 1
× [times/s]
100 ts
T1
100[%]
T1 + T2
T2
100[%]
T1 + T2
T1
ON
OFF
OUT OUT
END END
C3 C3
2
ON
n : Duty (%)
ts : Scan time [s]
T2