App. - 17 App. - 17
MELSEC-Q
PPENDIXES
(b) Input instruction
Tp = Sr + 0.09
Dr + T2
Tp (
1) : Time from the start of execution of the Input instruction to the
End processing of the sequence scan at the completion of
the Input instruction execution (ms)
Sr : Scan time
Dr : Number of bytes of reception data
T2 : QJ71C24N (-R2/R4) T2 = 7.0
QJ71C24 (-R2) T2 = 14.91
1 This stands for the time range of processing (Tp).
[Calculation example]
Estimate the time required to process the Input instruction when receiving
100 bytes of data using the non procedure protocol with the QJ71C24N.
(Unit: ms)
• Scan time : 10 ms
10 + 0.09
100 + 7.0 26.00 (ms)
2 When only using CH1 of the Q series C24 and when processing only
30 bytes of data received, the time until the reception data read request
(X3) comes on is displayed after the Q series C24 receives data from
the network.
3 When DX3 (direct mode) is used, the Q series C24 is accessed at the
time of the instruction execution on the sequence program. DX3
speeds up reading input compared to X3 (refresh mode). For
differences between modes, refer to the user's manual (function
explanation, program fundamentals) of the CPU module used.
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