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Checking Current Consumption and Power Consumption
After selecting a Power Supply Unit based on considerations such as the power supply voltage, calculate the current and power
requirements for each Rack.
Condition 1: Current Requirements
There are two voltage groups for internal power consumption: 5 V and 24 V.
Current consumption at 5 V (internal logic power supply)
Current consumption at 24 V (relay driving power supply)
Condition 2: Power Requirements
For each Rack, the upper limits are determined for the current and power that can be provided to the mounted Units. Design the
system so that the total current consumption for all the mounted Units does not exceed the maximum total power or the maximum
current supplied for the voltage groups shown in the following tables.
The maximum current and total power supplied for CPU Racks and Expansion Racks according to the Power Supply Unit model
are shown below.
Note 1. For CPU Racks, include the CPU Unit current and power consumption in the calculations. When expanding, also include the current and power consumption
of the I/O Control Unit in the calculations.
2. For Expansion Racks, include the I/O Interface Unit current and power consumption in the calculations.
Power Supply
Units
Max. current supplied
Max. total
power supplied
5 V 24 V (relay driving
current)
CJ1W-PA205C
5.0 A 0.8 A 25 W
CJ1W-PA205R
5.0 A 0.8 A 25 W
CJ1W-PA202
2.8 A 0.4 A 14 W
CJ1W-PD025
5.0 A 0.8 A 25 W
CJ1W-PD022
2.0 A 0.4 A 19.6 W
Conditions 1 and 2 below must be satisfied.
Condition 1: Maximum Current
(1) Total Unit current consumption at 5 V ≤ (A) value
(2) Total Unit current consumption at 24 V ≤ (B) value
Condition 2: Maximum Power
(1) × 5 V + (2) × 24 V ≤ (C) value
Example: Calculating Total Current and Power Consumption ■
Example: When the Following Units are Mounted to a CJ-series CPU Rack Using a CJ1W-PA205R Power Supply Unit
Unit type Model Quantity
Voltage group
5 V 24 V
CPU Unit CJ2H-CPU68-EIP 1 0.820 A —
I/O Control Unit CJ1W-IC101 1 0.020 A —
Basic I/O Units (Input Units) CJ1W-ID211 2 0.080 A —
CJ1W-ID231 2 0.090 A —
Basic I/O Units (Output Units) CJ1W-OC201 2 0.090 A 0.048 A
Special I/O Unit CJ1W-DA041 1 0.120 A —
CPU Bus Unit CJ1W-CLK23 1 0.350 A —
Current consumption
Total
0.820 + 0.020 + 0.080
× 2 + 0.090 ×
2 + 0.090 × 2 + 0.120 + 0.350
0.048 A
× 2
Result
1.83 A (
≤ 5.0 A) 0.096 A (≤ 0.8 A)
Power consumption Total
1.83
× 5 V = 9.15 W 0.096 A × 24 V = 2.30 W
Result
9.15 + 2.30 = 11.45 W (
≤ 25 W)
Note: For details on Unit current consumption, refer to Ordering Information.
Using the CX-Programmer to Display Current Consumption and Width ■
CPU Rack and Expansion Rack current consumption and width can be displayed by selecting Current Consumption and Width from
the Options Menu in the CJ2 Table Window. If the capacity of the Power Supply Unit is exceeded, it will be displayed in
red characters.
Example:
Power Supply
Unit model
Current
consumption
at 5 V
Current
consumption
at 26 V/24 V
Total current
consumption
Long-distance
expansion
Width