Datasheet
176 Programmable Controllers
Current Consumption
The amount of current/power that can be supplied to the Units mounted in a Rack is limited by the capacity of the Rack’s Power Supply Unit. The
system must be designed so that the total current consumption of the Units 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.
CPU Racks and Expansion Racks
The following table shows the maximum currents and power that can be supplied by Power Supply Units on CPU Racks and Expansion Racks.
Note: 1. When calculating current/power consumption in a CPU Rack, be sure to include the power required by the CPU Unit itself.
When expanding the configuration, be sure to include the power required by the I/O Control Unit.
2. When calculating current/power consumption in an Expansion Rack, be sure to include the power required by the I/O Interface Unit itself.
Be sure that both conditions 1 and 2 below are met.
Condition 1: Maximum Current Supply
1. Current required at 5 V DC by all Units (A) ≤ Maximum current consumption shown in table
2. Current required at 24 V DC by all Units (B) ≤ Maximum current consumption shown in table
Condition 2: Maximum Total Power Supply
A x 5 V DC + B x 24 V DC + C x 24 V DC £ Maximum total power consumption shown in table (C)
Example Calculations
In this example, the following Units are mounted to a CJ-series CPU Rack with a CJ1W-PA202 Power Supply Unit.
Power Supply Unit Maximum current consumption (C) Maximum total power
consumption
(A) 5-V group (B) 24-V group
relay driver power supply
24-V group
service power supply
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
CJ1W-PD022 2.0 A 0.4 A None 19.6 W
Unit Model Quantity 5- V DC 24- V DC
CPU Unit CJ1G-CPU45H 1 0.910 A ---
I/O Control Unit CJ1W-IC101 1 0.020 A ---
Input Units CJ1W-ID211 2 0.080 A ---
CJ1W-ID231 2 0.090 A ---
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-CLK21 1 0.350 A ---
Current consumption Calculation 0.910+0.020+0.080×2+0.090x2+
0.090x2+0.120+0.350
0.048 Ax2
Result 1.92 A (£5.0 A) 0.096 A (£0.8 A)
Power consumption Calculation 1.92x5 V=9.60 W 0.096 Ax24 V=2.304 W
Result 9.60+2.304=11.904 W (£25 W)
Y201-EN2-03.book Seite 176 Donnerstag, 30. März 2006 1:52 13