Specifications
30
3. Replacement of FX2NC series
3.3.2 Cautions about hardware
z Comparison of FX2N series and FX3U series and cautions for replacement
This is a list of hardware cautions. When performing replacement, please refer to the manual of each
model and conrm details there.
Hardware differences of FX
2NC series and FX3UC series, and cautions
No. Item
Difference
Caution
FX
2NC series FX3UC series
1
Battery and
mounting position
FX2NC-32BL
lithium thionyl
chloride primary
battery
FX3U-32BL
lithium manganese
dioxide primary
battery
Type name (model) is different.
Mounting position is different.
2 Voltage of battery
Nominal voltage
3.6V
Nominal voltage
3.0V
Be careful when using special
device D8005 (battery voltage).
3
Product width
dimension
-
Width of main unit
is shorter by 0.3 to
1mm depending on
the model.
See Fig. 1 on next page.
4
Input hardware lter
(when digital lter
is zero)
• High-speed
counter
• Input interrupt
function
• Pulse catch
function
X0, X1: 20μs
X2 to X7: 50μs
X10 to X17: 200μs*
*16-I/O point main
unit: 10ms
X0 to X5: 5μs
X6, X7: 50μs
X10 to X17: 200μs*
*16-I/O point main
unit: 10ms
Noise, not detected in FX2NC, may
affect input of FX3UC.
If necessary, implement a noise
countermeasure external to the
main unit.
5
Terminal end
resistance of
485ADP
Packaged together
with ADP; to
be selected and
mounted.
Built into ADP;
selectable using a
switch.
In FX3UC, the resistance value can
be selected using a built-in switch.
6
Wire size of
485ADP
AWG26 to 16 AWG22 to 20
Wire size is different. A large wire
size may not be usable in FX3UC.
(See cable size in Table 1. below).
Table 1. Cable size European terminal type connectors
For connection with RS-485 communication equipment, use a twisted pair cable with shielding.
Conforming wire size and tightening torque are as follows.
Wire size
of one-wire
connection
Wire size
of two-wire
connection
Wire ferrule
with insulation
sleeve
(wire size)
Tightening
torque
Insulation
sheath
stripping
length
*
FX2NC-485ADP
AWG26 to
AWG16
AWG26 to
AWG20
Not usable 0.4 to 0.5N·m 8mm
FX
3U-485ADP(-MB)
AWG22 to
AWG20
AWG22
Usable
(AWG22 to
AWG20)
0.22
to
0.25N
·
m
9mm
* Insulation sheath stripping length shows the dimension when connecting the wire to the terminal
directly.
For details, please refer to the FX Series User’s Manual (Data communication edition) JY997D16907.