Mitsubishi Electric MELSEC-L02SCPU User Manual page 214

A time lag occurs before start of the selected function due to any of the following factors:
• Input response time of the Function input signal
• Program scan time (for CH1 Selected counter function start command (SM1896))
• Internal control cycle (1ms) of the high-speed function (for CH1 Selected counter function start command
(SM1896))
The count error is as follows:
• Count error (maximum) when the Function input signal is used for the function
• Count error (maximum) in function execution by CH1 Selected counter function start command (SM1896)
In the case of the sampling counter function, a sampling time error due a component error (60 ppm) will also occur.
Therefore, the count error is as follows.
=
Pulse input speed (pulse/s) = pulse input frequency (Hz)  number of multiples (count)
*1
*2
Sampling time (s) =
212
Input response time setting value (up to 70) (ms)
1000
1 scan time (ms) + 2(ms)
1000
60(ppm)
2
*
Sampling time (s)
1000000
2
*
Sampling time (s) 6
100000
Sampling time setting value (ms)
1000
(s) Pulse input speed (pulse/s)
Pulse input speed (pulse/s) *
(s)
Pulse input speed (pulse/s)
1
*
Pulse input speed (pulse/s)
1
*
1
1
*