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4 SYSTEM CONFIGURATION
4.1 Rules of System Configuration
Current consumption
Power of extension devices is supplied from the CPU module or extension power supply module.
The number of extension devices that can be connected must be determined from the capacity of the power supply.
For details on the current consumption, refer to Page 48 Limitation on Current Consumption.
*1 Power is supplied to input circuit of input modules by service power supply or external power supply.
Limitations when using FX3 extension devices
■Bus conversion module
• A bus conversion module is required to use FX3 extension module. FX3 extension module can be connected to the right
side of the bus conversion module only.
• For limitation on the number of connectable modules, refer to Page 44 Connection to the bus conversion module
(connection with FX3 extension devices).
■Limitations on intelligent function modules
Note that some FX3 intelligent function modules have limitations on the number of modules and order in which they are added
for each individual module.
Model Limitations
FX3U-2HC Up to two modules connectable per system.
When FX5-1PSU-5V is not used, connect immediately after the bus conversion module.
FX3U-16CCL-M Only one module may be connected per system.
FX3U-64CCL Only one module may be connected per system.
FX3U-128ASL-M Only one module may be connected per system.
Power supply from CPU module
*1
Power supply from
FX5 extension power supply module
*1
Power supply from
powered input/output module
*1
CPU module
Expansion
adapters
Expansion
board
FX5
Intelligent
module
FX5
Intelligent
module
FX5
Intelligent
module
FX3
Intelligent
module
FX5
extension
power
supply
module
Bus
conversion
module
Input
module,
Output
module
Input
module,
Output
module
Input
module,
Output
module
Powered
input/
output
module