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

Max. current supplied

Max. total

 

 

Units

5 V

24 V (relay driving

power supplied

 

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 ⋅

 

0.048 A ⋅ 2

 

 

2 + 0.090 ⋅ 2 + 0.120 + 0.350

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

Current

 

Total current

 

 

Unit model

consumption

consumption

Width

 

at 5 V

Current

 

 

 

 

Long-distance

 

 

 

consumption

 

 

 

expansion

 

 

 

 

at 26 V/24 V

 

39

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Omron CJ2 Checking Current Consumption and Power Consumption, Example Calculating Total Current and Power Consumption
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CJ2 specifications

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