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6 Examination of System Configuration
6.5 Expansion of Main Unit
80
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
6.5.3 Selection example 2 using the 24V DC service power supply of the main unit
This subsection explains an example in which FX2N-2AD and 8 output points are added to the following
system configuration using the 24V DC service power supply of the main unit.
1 Confirm the priority of all extension blocks to be connected to the main unit.
The priority is determined by the extension block type without regard to the connection position
from the main unit as shown below.
2 Judge whether extension to the main unit is possible.
Judge the possibility of extension to the main unit for all extension blocks in turn, starting from a
block having the highest priority confirmed in step 1.
In this example, due to the restriction "two special function blocks", only the FX
3U
-64CCL (priority
1) and FX
2N
-2AD (priority 1) can be connected to the main unit.
3 Check whether extension from the 24V DC service power supply is possible.
Check using the quick reference matrix whether 8 input points and 16 output points whose exten-
sion is judged as impossible in step 2 can be added.
After 8 input points and 16 output points are connected, the remaining current of the 24V DC service power
supply is 50mA or less. Accordingly, it is possible to add 8 input points and 16 output points.
Input extension
block
8 points
Special function
block
FX
3U
-64CCL
Main unit
Special function
block
FX
2N
-2AD
Output extension
block
8 points
<Example of configuration>
Extension blocks to be added
(Special function block 1unit + output
8 points)
Range extendible to main unit
(Special function block 1unit + Input/output 16 points)
Output extension
block
8 points
Input extension
block
8 points
Special function
block
FX
3U-64CCL
Main unit
Special function
block
FX
2N-2AD
Output extension
block
8 points
<Priority>
Priority 1
Priority 2
Priority 3
Output extension
block
8 points
Priority 2
Priority 1
0 8 16 24 32
Number of added points
Output
Number of
added points
100 016
250 508
400 300 200 100 00
Input
150