Special Data Registers (D8000 And Later) - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
4.1.2

Special data registers (D8000 and later)

1. FX /FX /FX
3S 3G 3GC
Number and name
PLC status
The initial value is shown on the right (Unit: 1 ms)
(Transferred from the system ROM when the PLC power is
D 8000 turned ON).
Watchdog timer The value overwritten by a program is valid after the END or
WDT instruction was executed.
[D]8001 2 4
PLC type and system
Shown
version
on the right
• 2 ... 2K steps
• 4 ... 4K steps
[D]8002 • 8 ... 8K steps
Memory capacity • In the case of 16K steps or more
"8" is written to D8002, and "16", "32" or 64" is written to
D8102.
Type of the built-in memory, type of the RAM, EEPROM and
EPROM memory cassettes and ON/OFF status of the write
protect switch
Value
00H
[D]8003
01H
Memory type
02H
0AH
10H
8 0 6 0
[D]8004
Error M number
8060 to 8068(when M8004 is ON)
[D]8005
Battery voltage
Current value of battery voltage
(Example:3.0V)
Initial value
[D]8006
• 2.7V (Unit: 0.1 V)
Low battery voltage
(Transferred from the system ROM when the PLC power is
detection level
turned ON)
*1. "4" is displayed even when the memory capacity is set to 16K steps in the parameter setting.
/FX /FX PLCs
3U 3UC
Content of register
→ Refer to Subsection 4.2.2.
1 0 0
Version 1.00
Memory type
RAM memory cassette
EPROM cassette
EEPROM memory cassette or
flash memory cassette
EEPROM memory cassette or
flash memory cassette
Memory built in PLC
(Unit: 0.1 V)
3 0
4 Operations of Special Devices (M8000 and later, D8000 and later)
4.1 Special Device List (M8000 and later, D8000 and later)
FX 3U FX 3UC FX
200 200 200
24 24 26
8 8
Protect
switch
-
-
OFF
ON
-
Applicable model
Corresponding
3G FX 3GC FX 3S
special device
200 200 -
26 28 D8101
*1
8 8 D8102
4
-
M8004
- M8005
- M8006
1
2
3
4
5
6
7
177