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5-3 I/O Area of NP1F-MP2
(10) Module detection time (Address No. 13)
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• This is the module detection time data output area.
Module output time is the time measured in µs since transmission end interrupt was made on the SX bus until
periodic processing is started on the module.
SX bus
send end
Module
periodic timer
Module
detection time
On the module side, the above timer value (module detection time) is also updated when the data output to the SX
bus (CPU module input signal) is updated.
• From this data, the external pulse input frequency can be calculated.
f: Frequency Hz, T: Takt time µs, t
: Current module detection time µs, P
t
n
f = (P
- P
) / (T - t
n
n-1
Precautions:
• The time until the module detection time will overflows is 65.5ms.
When an overflow has occurred, this value returns to "0," and timer counting is continued (ring operation).
Feedback pulse frequency and command pulse frequency are also calculated by the above formula.
• This data is used, for example, to calculate the expected position of a spindle after the unit time has elapsed in
synchronous operation.
• Because the updating interval of this positioning module is 800µs (asynchronous with the tact time of the system),
maximum ±800µs of deviation may occur.
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0
9
8
t c
o i
n
i t
m
e
: Previous module detection time µs,
n-1
: Previous count-value pulse, P
n-1
+ t
) x 1000 x 1000
n-1
n
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2
: Current count-value pulse
n
5-66
1
0
Time
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