Mitsubishi FX3UC Series, Руководство пользователя

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264
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.6 Selection of the power supply for CC-Link/LT
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
9.6.3 System power supply calculation (FX
3UC
-32MT-LT built-in power supply)
1
Current consumption calculation
Using the formula below, calculate the total current consumption of the remote stations, I/O equip-
ment and the master station receiving power from the built-in power supply.
*1. Some remote I/O stations for CC-Link/LT supply the power for I/O via a CC-Link/LT dedicated flat
cable. For details, refer to the manual of each remote I/O station.
2
Voltage drop
Voltage drop of the built-in power supply can be calculated using "1. Quick reference list" or "2. Cal-
culation formula".
Voltage drop is in proportion to the connection cable length and the current consumption of con-
nected remote I/O stations and I/O equipment.
Calculate the voltage drop with respect to the cable length up to a remote station or the master sta-
tion that is located furthest from the main unit.
1. Selection based on the simplified graph (at supply voltage: 24V DC, ambient temperature:
20
°
C)
The graph on the right shows the relationship between current consumption (A) and the cable length
(m(inches)) that causes a voltage drop of 3.6 V.
When the relationship between the current consumption and the cable length is located inside the graph
(shaded region), the system can be constructed using only the built-in power supply.
However, the available main line length, branch
line length and total branch line length are
restricted by transmission speed.
•
Maximum cable length:
Cable length between remote I/O stations
located in farthest positions that receive
power from the built-in power supply in the
main unit (built-in master), power supply
adapter or dedicated power supply.
= +
≤
0.35A
Current
consumption
in CC-Link/LT
system
Total current consumption
of each module in CC-
Link/LT system
Total current consumption of I/O equipment
(such as sensors)
(to which power is supplied via
communication cable) *1
M
a
xi
m
u
m
c
a
bl
e
le
ng
th
[
m
(i
nc
he
s)
]
M
a
xi
m
u
m
c
a
bl
e
le
ng
th
[
m
(i
nc
he
s)
]
0.1
0.1
1.0
10
1.0
Current consumption [A]
(Supply voltage : 24V DC)
1000
0.35
268
When a VCTF cable, High flexible
cable or a combination of these
cables is used
0.1
0.1
1.0
10
100
1.0
Current consumption [A]
(Supply voltage : 24V DC)
1000
0.35
362
When a dedicated flat
cable is used
100