MELSEC-A
9. SELECTING AND EXECUTING THE COUNTER FUNCTION
9 - 4
9.1.2 Counting errors
When the selected function is executed through external input (applying voltage to
the F.START terminal) or a sequence program (turning on the counter function
selection start command), a count error occurs.
(1) For external input, there is the following count delay range.
[Maximum count delay]
1[ms]×pulse input speed [PPS]×multiplication number [count]
[Minimum count delay]
0.1[ms]×pulse input speed [PPS]×multiplication number [count]
(2) When a counter function selection is made by the sequence program, the number
of pulses counted during one sequence scan plus three link scans is added to the
counting delay in above (1).
(3) The internal clock error is calculated as follows.
Set time
×pulse input speed [PPS]×multiplication number [count]
10000
POINT
It is recommended to use the external input to make a counter function selection.
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