Mitsubishi FX3UC Series, Руководство пользователя

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305
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.16 Data Link Processing Time
1
O
utline
2
Exter
nal
D
im
en
sions
3
Ge
ne
ric
Speci
ficat
ions
4
Pow
er Suppl
y
Specif
icati
ons
5
Input Spec
ific
ations
6
O
utput
Specif
icat
ions
7
Exam
pl
es
of
W
iri
ng
fo
r
Va
rious U
ses
8
Te
rm
inal B
lock
9
CC
-L
in
k/L
T
Ma
ste
r F
X
3UC
(LT
only)
10
D
ispl
ay m
odule
FX
3UC
(L
T only)
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[
µ
s
] = a + (b
×
N)
×
c
1) a: Constant
Depends on the transmission speed
2) b: Constant
Depends on the transmission speed and point mode
3) c: Constant
Depends on the transmission speed
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
Transmission speed 2.5Mbps 625kbps 156kbps
Value a
4-point, 16-point
mode
22 88 353
Transmission speed 2.5Mbps 625kbps 156kbps
Value b
4-point mode 46 41 37
16-point mode 76 71 67
Transmission speed 2.5Mbps 625kbps 156kbps
Value c
4-point, 16-point
mode
0.4 1.6 6.4
0 20 40 60
Number of
stations
0
0.5
1.0
1.5
2.0
2.5
16-point mode
4-point mode
Link scan tim
e
(m
s)
Link scan time (at 2.5 Mbps)