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CHAPTER 8 FUNCTIONS
8
8.5 Counter Function Selection
8.5.2 Count error
8.5.2 Count error
A count error may occur when the selected counter function is performed by external input (A voltage is applied to the
function start input terminal.) or by a program (CH Counter function selection start command (Y6, YE) is turned on).
The following describes how to calculate the count error.
(1) Count error (maximum) due to a delay of response to an external input
(2) Count error (maximum) when the selected counter function is performed by a
program
(3) Count error (maximum) due to an internal clock delay when the sampling
counter function or the periodic pulse counter function is performed
1 [ms]
1000
[s] Pulse input speed [PPS] Multiplication [count]
1 scan time [ms]
1000
[s] Pulse input speed [PPS] Multiplication [count]
Sampling/periodic time setting value 10 [ms]
1000
[s]
Pulse input speed [PPS] Multiplication [count]
Error in design, 100 [ppm]
1000000
=
Pulse input speed [PPS] Multiplication [count]
1000000
(Sampling/periodic time setting value
(unit: 10ms))