Data Link Processing Time; Link Scan Time - Mitsubishi FX3UC SERIES User Manual

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
9.16

Data Link Processing Time

This section explains the link scan time and transmission delay time.

9.16.1 Link scan time

This paragraph explains the link scan time for the CC-Link/LT network.
1. Calculation formula
Link scan time[ µs
1) a: Constant
Depends on the transmission speed
Transmission speed
Value a
2) b: Constant
Depends on the transmission speed and point mode
Transmission speed
Value b
3) c: Constant
Depends on the transmission speed
Transmission speed
Value c
4) N: Final station number
As shown in the formula above, if the number of stations is held constant, the link scan time is
shorter in 4-point mode than in 16-point mode.
2. Graph
2.5
2.0
1.5
1.0
0.5
0
0
× ×
] = a + (b N) c
4-point, 16-point
mode
4-point mode
16-point mode
4-point, 16-point
mode
Link scan time (at 2.5 Mbps)
16-point mode
4-point mode
20 40 60
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
2.5Mbps 625kbps
22 88
2.5Mbps 625kbps
46 41
76 71
2.5Mbps 625kbps
0.4 1.6
Number of
stations
9.16 Data Link Processing Time
156kbps
353
156kbps
37
67
156kbps
6.4
305
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