Commercially
available
power supply
24V
Internal supply power (5V)
passes through the bus of
the backplane to each unit.
Power goes from a commercially available
power supply to each I/O unit.
FP2/FP2SHOverview
1 − 12
1.2 Unit Types and Combinations
1.2.2.2 Limitations on Current Consumption
Power supply unit Rated current (at 5V)
FP2−PSA1 2.5A
FP2−PSA2 2.5A
FP2−PSA3 5A
FP2−PSD2 5A
Internal supply power (5V DC)
The 5V DC power used for driving the internal circuit of each unit is supplied from the
power supply unit through the internal bus of the backplane.
External supply power (24V DC)
The 24V DC power supply used as the input power supply of the input units and the
output circuit driving power of the output units are supplied from the external terminal
of each unit.
For 24V power supply, commercially available power supply equipment is used.
Combining units and selecting a backplane
The current consumed by each unit is shown in the following pages.
Give consideration to the combination of units so that the rated capacity of 5V DC and
24V DC power supplies should not exceeded.
Example of current consumption calculation
The table below shows the combination of typical units on a 9-module type backplane.
Type Number of units and
backplane used
Current consumption at
5V DC (mA)
Current consumption at
24V DC (mA)
CPU (FP2−C1) 1 410 0
Backplane (FP2−BP09) 1 60 0
Input unit (FP2−X16D2) 3
60×3=180 8×16×3 = 384
Output unit (FP2−Y16R) 4
120×4=480 160 ×4=640
Total current consumption 1130 1024
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