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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
37.1.2 Special Data Register (D8000 to D8511)
Number and
name
Content of register
Applicable model
FX
3S
FX
3G
FX
3GC
FX
3U
FX
3UC
Correspond-
ing special
device
FX
1S
FX
1N
FX
1NC
FX
2N
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 – 200 200 200 200 200
[D]8001
PLC type and
system version
28 26 26 24 24
D8101
*1
22 26 26 24 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.
4
*2
8
8
8
8
D8102
2
8
8
4
8
4
8
[D]8003
Memory type
Type of internal memory/RAM/EEPROM/
EPROM cassette or ON/OFF status of protect
switch is stored
–
[D]8004
Error number M
M8004
[D]8005
Battery voltage
– M8005 – – –
[D]8006
Low battery voltage
detection level
Default:
•FX2N/FX2NC PLCs:
3.0V (in 0.1-V units)
•FX3G/FX3GC/FX3U/FX3UC PLCs:
2.7V (in 0.1-V units)
(Writes from system ROM at power ON)
– M8006 – – –
*1. The corresponding special data register D8101 is available only in FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs.
No corresponding device is available in FX
1S
/FX1N/FX1NC/FX2N/FX2NC PLCs.
*2. "4" is displayed even when the memory capacity is set to 16K steps in the parameter setting.
2 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 –
8 0 6 0
8060 to 8068 (when M8004 is ON)
3 0
Battery voltage present value
(Example: 3.0V)
(in 0.1-V units)