Selection Example 1 Using The 24V Dc Service Power Supply Of The Main Unit - Mitsubishi Electric MELSEC-F FX3G Series User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
6.5.2

Selection example 1 using the 24V DC service power supply of the main unit

This subsection explains an example in which 8 input points and 16 output points are added to the following
system configuration using the 24V DC service power supply of the main unit.
<Example of configuration>
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.
<Priority>
Main unit
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 "one special extension block and 16 points in input/output
extension block", the only FX
ority 2) 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 16 input points and 8 output points whose exten-
sion is judged as impossible in step 2 can be added.
Output
16 100
8 250
0 400 300 200 100
0
Number of added points
After 16 input points and 8 output points are connected, the remaining current of the 24V DC service power
supply is 50mA or less. Accordingly, it is possible to add 16 input points and 8 output points.
The remaining power supply capacity (50mA) can be used as a power supply for external loads (such as
, special adapters and special function blocks
sensors)
80
Input extension Special function
block
8 points FX
Range extendible to main unit
(Special function block 1unit + Input/output 16 points)
Input extension Special function
block
8 points FX
Priority 3
-64CCL (priority 1) and 16 points of the output extension block (pri-
3U
0
150 50
0
8 16 24 32
Input
Output extension
block block
-64CCL 8 points
3U
Output extension
block block
-64CCL 8 points
3U
Priority 1
by the user.
6 Examination of System Configuration
6.5 Expansion of Main Unit
Output extension Input extension
block
16 points
Extension blocks to be added
(Input 8 points + Output 16 points)
Output extension Input extension
block
16 points
Priority 2
block
8 points
block
8 points
Priority 3