MELSEC FX
0N
/FX
2N
Power Consumption
SYSTEM DESCRIPTION
Calculation of the Power Consumption
The power consumption figures on the
5 V DC bus for the special function
modules are shown in the specifications
tables on the following pages.
The maximum permissible currents on
the 5 V DC bus are shown in the table
below.
Module
FX
2N
-
FX
2N
-
M -ES(ESS)
E -ES(ESS)
Max. current on 5 V bus
290 mA
690 mA
簍
FX
0N
鎂
FX
2N
through FX
2N
-32M -E
,
Max. residual current values (in mA) for FX
2N
-16M -E
FX
2N
-32E -E
for the permissible configuration
24
Number of
additional
outputs
16
8
0
25
100
175
250
0
50
125
200
8
0
75
150
16
25
100
24
50
32
Number of additional inputs
Max. residual current values (in mA) for FX
2N
-48M -E
FX
2N
-48E -E
for the permissible configuration
48
40
Number of
additional
outputs
32
24
16
8
0
10
85
160
235
310
385
460
0
35
110
185
260
335
410
8
60
135
210
285
360
16
10
85
160
235
310
24
through FX
2N
-128M -E
,
The residual currents for the 24 V DC serv-
ice voltage at different input/output con-
figurations are shown in the tables
on the right.
Special function modules have to be sup-
plied external, if the residual current for
the service voltage is not satisfying.
A maximum of 256 I/Os are possible.
35
110
185
260
32
60
135
210
40
10
85
160
48
35
110
56
60
64
Number of additional inputs
Sample calculations
The table below and on the right show
different examples for sample power
calculation for a PLC system.
The current values for the special function
modules can be found in the specifica-
tions on the following pages.
Comparison with the current value tables
show that the calculated figures for the
5 V bus lie within the allowable ranges.
In the example below all units can be
supplied sufficiently with the internal
24 V power supply.
Module
FX2N-80MR-ES
FX2N-4AD
FX2N-4DA
FX2N-232IF
No.
1
3
2
1
24 V DC calculation
Current / module
460 mA
50 mA
200 mA
80 mA
Calculation
+460 mA
-150 mA
-400 mA
-80 mA
-170 mA !!!
簍
FX
0N
鎂
FX
2N
5 V DC calculation
Current / module
+290 mA
30 mA
30 mA
40 mA
Total current
+290 mA
-90 mA
-60 mA
-40 mA
290 - 190 mA
Result:
100 mA (OK !)
An external 24 V power supply has to
be added In the example above.
Module
FX2N-48MR-ES/UL
FX2N-16EYR-ES/UL
FX2N-8EX-ES/UL
FX2N-8EYR-ES/UL
FX0N-3A
No.
X
1
1
1
1
1
24
鈥?/div>
8
鈥?/div>
鈥?/div>
Number of I/Os
Y
24
16
鈥?/div>
8
鈥?/div>
X/Y
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
8
Total
24 V DC calculation
Total current
5 V DC calculation
Current / module
290 mA
Total current
+290 mA
0 mA
0 mA
0 mA
-30 mA
+260 mA (OK!)
X=8
Y = 24
漏
+185 mA
鈥?/div>
鈥?/div>
鈥?/div>
-90 mA
+95 mA (OK!)
30 mA
FX2N-32ER-ES/UL
FX2N-16EX-ES/UL
FX2N-4AD
FX2N-1HC
1
1
1
1
Result:
16
16
鈥?/div>
鈥?/div>
16
鈥?/div>
鈥?/div>
鈥?/div>
64 + 64 + 24 = 152 ! (< 256) OK!
鈥?/div>
鈥?/div>
8
8
X = 16
Y=0
+150 mA
30 mA
0 mA
+120 mA (OK!)
690 mA
鈥?/div>
50 mA
40 mA
+690 mA
0 mA
-30 mA
-90 mA
+570 mA (OK!)
漏
Total no. of I/Os which are connected to a base unit to caculate the max. residual current values (see tables)
see tables above (max. residual current values)
MITSUBISHI ELECTRIC
23
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