Mitsubishi FX3UC SERIES User Manual page 271

FX Series Programmable Controllers
3UC
User's Manual - Hardware Edition
2. Selection based on the calculation formula (at supply voltage: 24V DC, ambient
temperature: 20
1) When a dedicated flat cable is used
calculation formula
Voltage drop
(V)
Maximum
distance
Total current
consumption
*1. Some remote I/O stations for CC-Link/LT supply power for I/O via a CC-Link/LT dedicated flat cable.
When the current consumption is determined, the distance from the main unit to the furthest station can be
obtained from the following formula.
Maximum
distance (m)
Or when the distance from the main unit to the furthest station is determined, the allowable current
consumption can be obtained from the formula below.
Total current
≤
consumption
(A)
The simplified graph and the calculation formula for voltage drop may not always be accurate as effects such
as ambient temperature and the number of connectors used can influence the results.
When the voltage drops considerably, add a power supply adapter or dedicated power supply.
And if the driving voltage (20.4 V) cannot be assured in a remote station, take proper countermeasures.
General-
purpose power
supply voltage
2) When a dedicated flat cable, VCTF cable and high flexible cable are used together
calculation formula
Voltage drop
(V)
C)
°
Maximum
×
=
distance (m)
+ 55(Constant)
Distance from main unit to farthest remote I/O station that receives power from built-in power
supply
Total current consumption of
each CC-Link/LT station that
receives power from main unit
3.6 (V) - 1.1 (V)
≤
(Constant)
3.6 (V) - 1.1 (V)
÷
0.06 (Constant)
(Constant)
− ≥
20.4V
Voltage drop
Maximum
= ×
distance (m)
+ 45(Constant)
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.6 Selection of the power supply for CC-Link/LT
Total current
×
0.06 (Constant) consumption
Total current consumption of I/O equipment (such as
sensor) connected to remote I/O stations that receives
+
power from the main unit (through communication
cable) *1
→ For details, refer to the manual of each remote I/O station.
Total current
÷ ÷
consumption 0.06 (Constant)
(A)
Maximum
÷
distance (m)
+ 55 (Constant)
Total current
×
0.08 (Constant) consumption
1.1V
+ ≤ 3.6V
(Constant)
(A)
−
55 (Constant)
1.1V
≤ 3.6V
+
(Constant)
(A)
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