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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 -)
PLC Status
[D]8007
Momentary power
failure count
Operation frequency of M8007 is stored.
Cleared at power-off.
– 3 3 M8007 – – 3 – 3
D 8008
Power failure
detection
Default:
*1
•FX3U, FX2N PLCs: 10 ms (AC power supply type)
•FX
2NC, FX3UC PLCs: 5 ms
(DC power supply type)
– 3 3 M8008 – – 3 – 3
[D]8009
24V DC failed device
Minimum input device number of extension units in which
24V DC has failed.
3 3 3 M8009 – – 3 – 3
*1. The power failure detection time in FX2N and FX2NC PLCs is as follows.
-10ms for FX
2N PLCs used with a 100V AC power supply system. D8008 is set to 10ms by default.
- 100ms maximum for FX
2N PLCs used with a 200V AC power supply system. D8008 can be set in the
range from 10 to 100ms.
-5ms for FX
2N PLCs used with a DC power supply type. Write "K-1" to D8008 for correction.
-5ms for FX
2NC PLCs used with a DC power supply type. System writes "K-1" to D8008 for correction. Do
not make any change in a sequence program.
-For FX
3U and FX3UC PLCs, refer to Subsection 37.2.4.
Clock
[D]8010
Present scan time
Accumulated instruction-execution time from step 0
(in 0.1-ms units)
→Refer to Subsection 37.2.5
3
Same
as on
the
right
3
Same
as on
the
right
3
Same
as on
the
right
–
3
Indicated value includes wait-
ing time of constant scan opera-
tion (when M8039 is activated).
[D]8011
Minimum scan time
Minimum value of scan time
(in 0.1-ms units)
→Refer to Subsection 37.2.5.
–
[D]8012
Maximum scan time
Maximum value of scan time
(in 0.1-ms units)
→Refer to Subsection 37.2.5.
–
D 8013
Second data
0 to 59 seconds
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8014
Minute data
0 to 59 minutes
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8015
Hour data
0 to 23 hours
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8016
Day data
1 to 31 days
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8017
Month data
1 to 12 months
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8018
Year data
2 digits of year data (0 to 99)
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
D 8019
Day-of-the-week data
0 (Sunday) to 6 (Saturday)
(for real time clock)
→Refer to Subsection 37.2.7.
3 3 3 – 3333
3
*2
*2. A memory board having the real time clock function is required in FX2NC PLCs.
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