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6 Examination of System Configuration
6.7 Expansion of Extension Power Supply Unit (FX3U-1PSU-5V)
87
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Input/Output
Nos., Unit Nos.
8
Installation
9
Preparation and
Power Supply
Wiring
10
Input Wiring
*1. Input/output occupied points by special function blocks are excluded.
*2. For the input extension block (including the FX
2N-8ER-ES/UL and FX2N-8ER), it is not necessary to
calculate the current consumption of the internal 24V DC. Include the input extension block in
calculation for the nearest main unit or input/output powered extension unit located on the upstream
side to the extension power supply unit.
→ When the main unit is on the upstream side, refer to Subsection 6.5.1 and Subsection 6.5.2.
→ When the input/output powered extension unit is on the upstream side, refer to Subsection 6.6.1
and Subsection 6.6.2.
*3. A maximum of 8 special function units/blocks are connectable, including the main unit and the input/
output powered extension unit.
3 Determine whether the devices can be added to the extension power supply
unit.
Calculate the current to confirm whether the selected extension devices can be connected.
1. Calculate the current consumption of the built-in 5V DC power supply.
2. Calculate the available current supply from the internal 24V DC power supply.
3. Calculate the available input/output occupied points (excluding the occupied input/output
by special function blocks).
If the calculation result for the 5V DC power supply is a negative value, the current consumption exceeds the
power supply capacity.
If the calculation result for the internal 24V DC is a negative value, the current consumption exceeds the
power supply capacity.
If the calculation result for the number of occupied input/output points is a negative value, the available
number of input/output points is exceeded.
Reconfigure the system with an input/output powered extension unit.
mA
4 -1
mA
3 -1
-
Extension power
supply unit
Total of current consumed
by extension devices
Current consumption
Capacity of 5V DC
power supply
mA
0m
A
=
Calculation result
mAmA
3 -2 4 -2
-
mA
0m
A
=
Current consumption
Power supply
capacity for internal
24V DC
Calculation result
Extension power
supply unit
Total of current consumed
by extension devices
points
4 -3
points
3 -3
-
points
0points=
Number of I/O
occupied points
Connectable I/O
occupied points
Calculation result
Extension power
supply unit
Total of I/O occupied points
by extension devices