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6 Examination of System Configuration
6.5 Expansion of Main Unit
76
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
6.5 Expansion of Main Unit
The extendibility of the main unit varies depending on the power supply type (AC power supply type or DC
power supply type). Select proper extension devices in accordance with the power supply type of the main
unit used.
In the case of AC power type main unit
The allowable extension to the AC power supply type main unit varies depending on used extension blocks
as described below.
1. When connecting only the input/output extension block
Input/output extension blocks of up to 32 points can be connected.
However, when the extension power supply unit (FX3U-1PSU-5V) is used and the main unit is the nearest
upstream unit to the extension power supply unit, make sure that the number of points including the input
extension block (including the FX
2N-8ER-ES/UL and FX2N-8ER) extended to the extension power supply unit
does not exceed 32.
2. When connecting the input/output extension block and special function block
Input/output extension blocks of up to 16 points can be connected.
However, when the extension power supply unit (FX3U-1PSU-5V) is used and the main unit is the nearest
upstream unit to the extension power supply unit, make sure that the number of points including the input
extension block (including the FX
2N-8ER-ES/UL and FX2N-8ER) extended to the extension power supply unit
does not exceed 16.
Only 1 special function block can be connected.
3. When connecting only the special function block
Up to 2 special function blocks can be connected.
When extension of the above points 1 to 3 is carried out and further extension is required, determine whether
extension is possible using one of the following methods:
• Using the 24V DC service power supply (400mA) of the main unit
• Using an input/output powered extension unit
• Using an extension power supply unit
For details, refer to the following.
→ Refer to 6.5.1 When adding input/output extension blocks using the 24V DC service power supply
of the main unit.
→ Refer to 6.6 Expansion of FX2N Series I/O Powered Extension Unit.
→ Refer to 6.7 Expansion of Extension Power Supply Unit (FX3U-1PSU-5V).