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FX2N-64CL-M CC-Link/LT Master Block
9.
Data Link Processing Time
This section explains the link scan time and transmission delay time.
9.1
Link scan time
This paragraph explains the link scan time for the CC-Link/LT network.
9.1.1
Link scan time calculation formula
Link scan time = a + ( b × N ) × c [µs]
a: Constant (depends on the transmission speed)
Transmission speed
Value a
b: Constant (depends on the transmission speed and point mode)
Transmission speed
Value b
c: Constant (depends on the transmission speed)
Transmission speed
Value c
N: Final station No.
As shown in the formula above, if the number of stations is held constant, the link scan time is
shorter in the 4-point mode than in the 16-point mode.
2.5Mbps
22
2.5Mbps
4-point mode
46
16-point mode
76
2.5Mbps
0.4
Link scan time (at 2.5 Mbps)
2.5
16-point mode
2.0
4-point mode
1.5
1.0
0.5
0
0
20
625kbps
156kbps
88
625kbps
156kbps
41
71
625kbps
156kbps
1.6
Number of
stations
40
60
Data Link Processing Time 9
353
37
67
6.4
9-1
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