System Power and Expansion

B-110 Programmable Controller

CJ1

Current Consumption

Calculate All Aspects of Current Consumption

J Calculating Maximum Current Consumption

A. Calculate Maximum Current Supply (See the table below.)

•

Current required at 5 VDC by all Modules in column (A)

≤ Maximum current consumption shown in table

•

Current required at 24 VDC by all Modules in column (B)

≤ Maximum current consumption shown in table

•

Current required at 24 VDC for service power supply in column (C)

≤ Maximum current consumption shown in table

B. Calculate Maximum Total Power Supply (See the table below.)

•

A

× 5VDC +B × 24 VDC + C × 24 VDC ≤ Maximum total power consumption shown in column (D)

•

The amount of current/power that can be supplied to the Modules mounted in a Rack is limited by the capacity of the

Power Supply Unit.

•

Design the system so that the total current consumption of the Modules does not exceed the maximum current for

each voltage group and the total power consumption does not exceed the maximum for the Power Supply Unit.

Reference Table for Maximum Current Consumption

The following table shows the maximum currents and power that can be supplied by Power Supply Units on CPU Racks

and Expansion Racks.

Power Supply Unit

Maximum current consumption

(D) Maximum total

ti

pp y

(A) 5-V group

(B) 24-V group

relay driver power supply

(C) 24-V group

service power supply

( )

power consumption

CJ1W-PA205R

5.0 A

0.8 A

None

25 W

CJ1W-PA202

2.8 A

0.4 A

None

14 W

CJ1W-PD025

5.0 A

0.8 A

None

25 W

Note:1. When calculating current/power consumption in a CPU Rack — be sure to include the power required by the

CPU itself. When expanding the configuration, be sure to include the power required by the I/O Control Module.

2. When calculating current/power consumption in an Expansion Rack — be sure to include the power required by

the I/O Interface Module itself.

J Example Calculations

In this example, the following modules are mounted to a CJ1 Series CPU Rack with a CJ1W-PA205R Power Supply Unit.

Module

Model

Quantity

5VDC

24 VDC

CPU

CJ1G-CPU45

1

0.910 A

—

I/O Control Module

CJ1W-IC101

1

0.020 A

—

Input Modules

CJ1W-ID211

2

0.080 A

—

p

CJ1W-ID231

2

0.090 A

—

Output Modules

CJ1W-OC201

2

0.090 A

0.048 A

Special I/O Module

CJ1W-DA041

1

0.120 A

—

CPU Bus Module

CJ1W-CLK21

1

0.350 A

—

Current

consumption

Calculation

0.910+0.020+0.080

×2+0.090×2+

0.090

×2+0.120+0.350

0.048 A

×2

Result

1.92 A (

≦5.0 A)

0.096 A (

≦0.8 A)

Power consumption

Calculation

1.92

×5V=9.60 W

0.096 A

×24 V = 2.304 W

p

Result

9.60+2.304 = 11.904 W (

≦25 W)