Special Data Register (D8000 To D8511) - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition

37.1.2 Special Data Register (D8000 to D8511)

Number and name
PLC Status
Default value is shown on the right (in 1ms steps)
D 8000 (Writes from system ROM at power ON)
Watchdog Value overwritten by program is valid after END or
timer WDT instruction execution.
[D]8001
PLC type and
system version
• 2...2K steps
• 4...4K steps
[D]8002 • 8...8K steps
Memory capacity • If 16K steps or more
"8" is written to D8002, and "16", "32" or "64" is
written to D8102.
Type of internal memory/RAM/EEPROM/EPROM
cassette or ON/OFF status of protect switch is stored
Present
value
00H
01H
[D]8003
Memory type
02H
0AH
10H
[D]8004
Error number M
8060 to 8068 (when M8004 is ON)
[D]8005
Battery voltage
Battery voltage present value (Example: 3.0V)
Default:
[D]8006 • FX
Low battery voltage • FX
detection level units)
(Writes from system ROM at power ON)
*1. The corresponding special data register D8101 is available only in FX
No corresponding device is available in FX
890
Content of register
→Refer to Subsection 37.2.2.
2 4 1 0 0 BCD converted value
Version 1.00
Indicated on the right
Type of memory
RAM memory cassette
EPROM memory cassette
EEPROM memory
cassette or flash memory
cassette
EEPROM memory
cassette or flash memory
cassette
Built-in memory in PLC
8 0 6 0 BCD converted value
BCD converted value
3 0
(in 0.1-V units)
and FX PLCs: 3.0V (in 0.1-V units)
2N 2NC
, FX and FX PLCs: 2.7V (in 0.1-V
3G 3U 3UC
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
FX FX FX
3G 3U 3UC
200 200 200
26 24 24
8 8 8
Protect
switch
–
–
OFF
ON
–
, FX , FX , FX
1S 1N 2N 1NC
Applicable model
Correspond-
ing special FX FX FX
1S 1N 2N
device
– 200 200 200 200
*1
22 26 24
D8101
D8102 4
2 8
8
–
M8004
M8005 – –
M8006 – –
, FX and FX
3G 3U 3UC
, and FX PLCs.
2NC
FX FX
1NC 2NC
200
26 24
4
8
8
–
–
PLCs.