FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
92
6 Examination of System Configuration
6.2 Rules of System Configuration
3 Calculation of current consumption
The power is supplied to each connected device from the built-in power supply of the main unit, the input/
output powered extension unit or the extension power supply unit.
There are three types of built-in power supplies; 24V DC service power, 5V DC power and internal 24V DC
power. The power to be consumed varies depending on the type of product to be added.
* When connecting an input extension block on the downstream side of an extension power supply unit,
supply the power to the input extension block from the nearest main unit on the upstream side, or from an
input/output powered extension unit on the upstream side of the extension power supply unit.
In the example above, the input/output powered extension unit supplies the power to extension blocks.
→ For details, refer to Section 6.5 "Expansion of Main Unit (Calculation of Current Consumption)".
→ For details, refer to Section 6.6 "Expansion of FX2N Series I/O Powered Extension Unit (Calculation
of Current Consumption)".
→ For details, refer to Section 6.7 "Expansion of Extension Power Supply Unit (FX3U-1PSU-5V)".
Refer to Section 6.5. Refer to Section 6.6. Refer to Section 6.7.
Power supply
from main unit
Power supply from
input/output powered
extension unit
Power supply from
extension power supply
unit*
Power supply
from main unit
Extension block
(some blocks can
be connected)
Extension block
(some blocks can
be connected)
Extension block
(some blocks can
be connected)
Main unit
Input/output
powered
extension
unit
Extension
power supply
unit
Expansion
board
Special
adapter
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