6 Examination of System Configuration
6.6 Expansion of FX2N Series I/O Powered Extension Unit
66
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
6.6 Expansion of FX2N Series I/O Powered Extension Unit
When extension is not possible due to the main unit connection restrictions described in the preceding section
and extension of input/output is required, select the 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 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 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 FX
2N
-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
FX2N-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 150mA or less.
Main unit
Input/output
extension
block
Special
function block
Input 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
Output extension
block (16 points)
AC power supply
DC input type
FX2N
-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
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