When Adding Input/Output Extension Blocks Using The 24V Dc Service Power Supply Of The Main Unit - Mitsubishi FX3G SERIES User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
6.5.1 When adding input/output extension blocks using the 24V DC service power supply
of the main unit
If extension is not allowed due to restrictions in connection to the main unit described in the preceding
subsection, extension blocks can be added using the 24V DC service power supply of the main unit.
For adding extension blocks using the 24V DC service power supply, it is necessary to examine again
whether extension is possible for all of extension blocks selected in the preceding subsection and extension
blocks to be selected in this subsection.
Note that only up to two network-related special function blocks can be connected including extension to the
main unit.
1
Confirm the priority of all extension blocks to be connected to the main unit.
The priority is set to each extension block to be connected, and required to judge the possibility of
extension to the main unit. The priority is determined by the extension block type without regard to
the connection position.
When the extension power supply unit (FX
the extension power supply unit is the main unit, the priority should be considered also for input
extension blocks (including the FX
supply unit.
<Priority>
Priority High
Special function
block
Priority 1
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 the
extension block having the highest priority confirmed in step 1. Consider that 16 input/output points
are provided in each of the FX
ity over 8 input points. Refer to the preceding subsection for judgment about the possibility of
extension to the main unit.
3
Check whether extension from the 24V DC service power supply is possible.
Check using the quick reference matrix shown below whether the number of points whose exten-
sion is judged as impossible in step 2 can be added using the 24V DC service power supply.
A special function block is handled in the same way as 16 output points.
Output
16 100
8 250
0 400 300 200 100
0
Number of added points
Example: When 8 input points and 8 output points are connected, the current of the 24V DC service
power supply becomes 150mA or less.
62
2N
Output extension
block
>
Priority 2
-8ER-ES/UL and FX
2N
(Example)
0
150 50
0
8 16 24 32
Input
-1PSU-5V) is used and the nearest upstream unit to
3U
-8ER-ES/UL and FX
2N
FX -8ER-ES/UL
2N
FX -8ER
2N
> >
Priority 3
-8ER. Eight output points have higher prior-
2N
6 Examination of System Configuration
6.5 Expansion of Main Unit
-8ER) extended to the extension power
Priority Low
Input extension
block
Priority 4