Specifications

37
3. Replacement of FX2NC series
1
Introduction
2
Replacement of FX2N series
3
Replacement of FX2NC
series
4
Program changeover method
A
Models affected by production termination
B
Related manuals
C
Frequently asked questions
Device FX2NC series FX3UC series
Division Use Number
No. of
points
Number
No. of
points
D
Data
register
General use
(16-bit) [variable]
D0 to D199
200
points
D0 to D199
200
points
Latched
(16-bit) [variable]
D200 to D511
312
points
D200 to D511
312
points
Latched
(16-bit) [variable]
D512 to D7999
7488
points
D512 to D7999
7488
points
Special (16-bit) D8000 to D8255
256
points
D8000 to D8511
512
points
Index (16-bit)
V0 to V7,
Z0 to Z7
16
points
V0 to V7,
Z0 to Z7
16
points
Extension register
(16-bit)
- - R0 to R32767
32768
points
Extension le register
16-bit
- -
ER0 to ER32767
(when memory
cassette is installed)
32768
points
P
Pointer
For JUMP, CALL branch P0 to P127
128
points
P0 to P4095
4096
points
Input interrupt I00 to I50 6 points I00 to I50
6 points
in total
Input delay interrupt - - I00 to I50
Timer interrupt I6 to I8 3 points I6 to I8 3 points
Counter interrupt I010 to I060 6 points I010 to I060 6 points
3.5 Replacement of PLCs
The following includes main points of caution when replacing main units and expansion equipment.
As for the detail of each item, please refer to the reference page of this manual, and the hardware and
programming manuals of the PLCs and related documents.
Applicable
equipment
Item Measures and cautions
Reference
page
Main unit
Input and output connection FX
2NC input and output connectors, as well as
24V DC connectors are identical to those of
the FX3UC, in shape and signal arrangement.
Detach the connectors from the FX2NC and
attach them to the FX3UC.
Section 3.3
24V DC power connection
RS-485
communication
expansion
equipment
Checking cable size of wiring
for FX
2NC-485ADP
Make sure RS-485 communication equipment
conforms to the corresponding wire size.
If it does not conform, change the wire size.
Handling of terminal end
resistance of FX
2NC-485ADP
FX3UC RS-485 communication equipment
incorporates terminal end resistance. Select the
resistance value by using the built-in selection
switch.
Other
expansion
equipment
Wiring to each unit and block
Re-wiring is needed for terminal block type
equipment.
Operation
conrmation
Operation and test of sequence
program
Operate the replacement sequence program
and hardware equipment check and adjust the
equipment function, and operation timing.
Note the difference in function mentioned
in the reference page, and make sure the
equipment operates in conformity with the
designed specication.
Section 3.4