Filter
Top Products
835
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
31
FNC275-FNC279
Data
Transfer 3
32
FNC280-FNC289
High Speed
Processing 2
33
FNC290-FNC299
Extension File
Register
34
FNC300-FNC305
FX
3U
-CF-ADP
35
SFC•STL
Programming
36
Interrupt
Function
37
Special Device
38
Error Code
A
Version Up
Information
B
Execution Times
37.1.2 Special Data Register (D8000 to D8511)
Number and name Content of register
Applicable model
FX
3G
FX
3U
FX
3UC
Correspond-
ing special
device
FX
1S
FX
1N
FX
2N
FX
1NC
FX
2NC
PLC Status
D 8000
Watchdog
timer
Default value is shown on the right (in 1ms steps)
(Writes from system ROM at power ON)
Value overwritten by program is valid after END or WDT
instruction execution.
→Refer to Subsection 37.2.2.
200 200 200 – 200 200 200 200 200
[D]8001
PLC type and
system version
26 24 24
D8101
*1
22 26 24 26 24
[D]8002
Memory capacity
• 2...2K steps
• 4...4K steps
• 8...8K steps
• If 16K steps or more
"8" is written to D8002, and "16", "32" or "64" is written
to D8102.
3
8
3
8
3
8
D8102
3
2
3
8
3
4
8
3
8
3
4
8
[D]8003
Memory type
Type of internal memory/RAM/EEPROM/EPROM cassette
or ON/OFF status of protect switch is stored
3 3 3 – 3333 3
[D]8004
Error number M
3 3 3 M8004 33333
[D]8005
Battery voltage
3 3 3 M8005 – – 3 – 3
[D]8006
Low battery voltage
detection level
Default:
•FX
2N and FX2NC PLCs: 3.0V (in 0.1-V units)
•FX
3G, FX3U and FX3UC PLCs: 2.7V (in 0.1-V units)
(Writes from system ROM at power ON)
3 3 3 M8006 – – 3 – 3
*1. The corresponding special data register D8101 is available only in FX3G, FX3U and FX3UC PLCs.
No corresponding device is available in FX
1S
, FX1N, FX2N, FX1NC, and FX2NC PLCs.
BCD converted value2 4 1 0 0
Indicated on the right
Version 1.00
Present
value
Type of memory
Protect
switch
00H RAM memory cassette –
01H EPROM memory cassette –
02H
EEPROM memory
cassette or flash memory
cassette
OFF
0AH
EEPROM memory
cassette or flash memory
cassette
ON
10H Built-in memory in PLC –
BCD converted value8 0 6 0
8060 to 8068 (when M8004 is ON)
BCD converted value
(in 0.1-V units)
3 0
Battery voltage present value (Example: 3.0V)