Mitsubishi Electric MELSEC iQ-F Series User Manual page 45

Number of connected extension modules
A maximum of four extension modules can be connected on the right side of the CPU module.
1 2
Up to 2
Up to 4
When a powered input/output module or extension power supply module is used, a maximum of eight extension modules can
be connected.
The extension power supply module is not included in the number of connected modules.
1 2
Up to 2
Up to 4
The following lists the restrictions when the extension modules ( and ) are connected after the CPU module.
No. Restriction

The total number of occupied I/O points of the extension modules must be within 32.
When the first module of the extension modules  occupies 32 points, only this module (one module) can be connected.
 In any condition, each extension module consumes 200mA generated from the 24VDC service power supply.
When the first to third extension modules use the 24VDC service power supply of the CPU module and the 24VDC service power supply will be no
longer able to supply sufficient power (200mA), a next extension module cannot be connected.
*1 When the FX5-EX/ES, FX5-16ET/ESS, and FX5-16ET/ESS are connected and the 24VDC service power supply of the CPU module
is used for their input circuits, they do not consume the 24VDC service power supply.
3 4
Up to 2
1
Powered
3 4
input/output module,
FX5 extension
power supply module
Up to 2
Up to 8
2 3 7 8
...
Up to 8
*1
2.3 System Configuration Specifications
2 SYSTEM CONFIGURATION
2
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