Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual page 847

No. Name Data stored
SD152 Momentary Momentary
power failure power failure
detection count detection count
(power supply for power supply
module 1) module 1
SD153 Momentary Momentary
power failure power failure
detection count detection count
(power supply for power supply
module 2) module 2
SD154 Details of the Details of the
invalid power invalid power
supply module supply module
(bit pattern)
0: Valid/power-
off/no power
supply
module
1: Invalid
*1 There are restrictions on the firmware version of the supported CPU module. ( Page 1008 Added and Enhanced Functions)
Details
• This register counts the number of momentary power failures.
• This register monitors the status of the power supply module mounted on
the main base unit and counts the number of momentary power failures.
• When the CPU module starts up, the counters of the both power supplies
are cleared to 0.
• When one of the two power supply is powered off, the corresponding
counter to the one powered off is cleared to 0.
• The counter is incremented by one upon one momentary power failure on
each power supply. A counting cycle from 0 to 65535 to 0 is repeated.
• In a multiple CPU system, the status is stored only to the CPU module
No.1.
• For the redundant power supply base unit, when an invalid power supply
module exists, the status is stored using the following bit pattern.
• Bits corresponding to power-off or empty slots for the power supply
module turn off.
• In a multiple CPU system, the status is stored only to the CPU module
No.1.
(2)
b15 b9 b8 b7
(1) Details of the invalid power supply module 1
b0:Main base unit
b1 to b7: 1st to 7th level of the extension base unit
(2) Details of the invalid power supply module 2
b8: Main base unit
b9 to b15: 1st to 7th level of the extension base unit
(1)
b2 b1 b0
Appendix 5 List of Special Register Areas
Set by CPU
(setting
timing)
*1
S (Status Rn
change) RnP
RnPSF
*1
S (Status Rn
change) RnP
RnPSF
*1
S (Status Rn
change) RnP
RnPSF
A
APPX
845