Mitsubishi Electronics MELSEC-F Manuel D’Utilisation
A-27
4 Comparison of Performance Specifications
4.1 Analog Input
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
Common Items
A
C
ommon Item
s
B
FX
3U
-4A
D
D
FX
3UC
-4A
D
D
C
FX
3U
-4AD
-A
DP
D
FX
3G
-2A
D
D
-B
D
E
FX
3U
-4D
A
A
F
FX
3U
-4DA
-A
DP
G
FX
3G
-1D
A
A
-B
D
H
FX
3U
-3
A-
AD
P
P
I
FX
3U
-4A
D
D
-P
T
-
A
D
P
J
FX
3U
-4AD
-P
TW
-A
D
P
4.1.7
FX
2N
-8AD
*1.
Adjustment of the offset or gain value will not affect the resolution. In the direct indication mode, however, the
offset/gain cannot be adjusted.
offset/gain cannot be adjusted.
*2.
The offset and the gain should satisfy the following condition:
1V
1V
≤
(Gain - Offset)
*3.
The offset and the gain should satisfy the following condition:
3mA
3mA
≤
(Gain - Offset)
≤
30mA
*4.
The resolution and the input/output characteristics depend on the selected mode.
*5.
If 1 or more channels use the thermocouple input(s), the input voltage/current data conversion speed will be
"1 ms
"1 ms
×
number of selected channels."
Specifications
FX
2N
-8AD
Voltage input
Current input
Number of input points
8ch
Analog input range
-10V to +10V DC
(Input resistance: 200 k
Ω)
-20mA to +20mA DC
4mA to 20mA DC
(Input resistance: 250
Ω)
Absolute maximum input
±15V
±30mA
Offset
-10V to +9V
*1,*2
-20mA to +17mA
*1,*3
Gain
-9V to +10V
*1,*2
-17mA to +30mA
*1,*3
Digital output
With sign, 15 bits, binary
With sign, 14 bits, binary
Resolution
*4
0.63mV(20V
×1/32000)
2.5mV(20V
×1/8000)
2.50
μA(40mA×1/16000)
2.00
μA(16mA×1/8000)
Ov
er
al
l a
ccu
ra
cy Ambient temperature:
25±5
°C
±0.3%(±60mV) for 20V full scale
±0.3%(±120μA) for 40mA full scale
Same accuracy for 4mA to 20mA input
Ambient temperature:
0 to 55
0 to 55
°C
±0.5%(±100mV) for 20V full scale
±0.5%(±200μA) for 40mA full scale
Same accuracy for 4mA to 20mA input
Time required for A/D
conversion
conversion
500
μs × number of selected channels
*5
Input characteristics
*4
Insulation method
• The photocoupler is used to insulate the analog input area from the PLC.
• The DC/DC converter is used to insulate the power supply from the analog inputs.
• Channels are not insulated from each other.
• The DC/DC converter is used to insulate the power supply from the analog inputs.
• Channels are not insulated from each other.
Number of I/O points
occupied
occupied
8 points (Taken from either the input or output points of the PLC.)
z
When the input mode is set to "0":
0
+16000
+10V
+10.
2V
+16320
-10V
-10.
2V
-16000
-16320
z
When the input mode is set to "6":
0
+8000
+20mA
-20mA
-8000
+8160
+20.
4m
A
Approx.-8160
-20.
4
m
A
z
When the input mode is set to "3":
0
8000
20mA
4mA
8200
20.
4m
A