Mitsubishi FX3U Series User Manual

FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
94
6 Examination of System Configuration
6.6 Expansion of FX2N Series I/O Powered Extension Unit (Calculation of Current Consumption)
6.6 Expansion of FX2N Series I/O Powered Extension Unit (Calculation of
Current Consumption)
If the selected devices in the previous section cannot be connected due to a shortage of current from the
main unit’s built-in 24V DC sercive power supply, add an input/output powered extension unit.
Since input/output powered extension units have built-in input/output terminals, reexamine the input/output
devices connected to the main unit to ensure the required number of points.
Determine whether extension devices can be connected to the input/output powered extension unit by the
following method.
• When only input/output extension devices are added, use the quick reference matrix.
→ Refer to Subsection 6.6.1 "Quick reference matrix (when only input/output devices are added)".
• When also special extension devices are added, calculate the current consumption to ensure that the total
current to be consumed by the added extension devices can be supplied by the built-in power supply.
→ Refer to Subsection 6.6.2 "When special extension devices are also added (calculation of current
consumption)".
6.6.1 Quick reference matrix (when only input/output devices are added)
In the following quick reference matrix, the value at the intersection of the number of input points to be added
(horizontal axis) with the number of output points to be added (vertical axis) indicates the remaining power
supply capacity.
1 Select the input/output extension block (number of points) to be connected
to the main unit.
Check that the number of input/output points can be added.
When connecting the FX
3U-1PSU-5V extension power supply unit to a system where the nearest
upstream unit to the FX
3U-1PSU-5V is an input/output powered extension unit, include the current
consumption by the input extension blocks (including FX
2N-8ER-ES/UL and FX2N-8ER) connected
to the FX
3U-1PSU-5V when calculating the total current consumption of the input/output powered
extension unit.
1. AC power supply/DC input type
1) FX2N-32ER, FX2N-32ET, FX2N-32ES
FX
2N-32ER-ES/UL, FX2N-32ET-ESS/UL
(Example) When a 16-input and 0-output point extension block is connected to FX
2N-32E, the current
of the 24V DC service power supply becomes 150 mA or less.
Main unit
Input/output
extension
block
Special
function block
Input extension
block (16 points)
Output extension
block (16 points)
Special
function block
Main unit
Input/output
extension
block
Special
function block
Input/output powered
extension unit
(32 points)
Special
function block
Range to be covered by main unit
Range exceeding power supply capacity
Before
selection
After
selection
Replaced with input/output powered
extension unit
AC power supply
DC input type
FX 2N -32E 
0 8 16 24 32
Input
Output
2524
100 50 016
175 125 75 258
250 200 150 100 50
0
Number of
added points
(Example)
Number of added points

Mitsubishi FX3U Series Specifications

General

Brand	Mitsubishi
Model	FX3U Series
Category	Controller
Language	English