Mitsubishi QJ71LP21 Reference Manual page 410

APPENDIX
Number Name Meaning
Power
supply off Power supply off
SD1780
detection detection status
status
Power
supply
Power supply failure
SD1781 failure
detection status
detection
status
Momentary
power
failure Momentary power
SD1782 detection failure detection count
counter for for power supply 1
power
supply 1*1
Momentary
power
failure Momentary power
SD1783 detection failure detection count
counter for for power supply 2
power
supply 2*1
*1: The "power supply 1" indicates the redundant power supply module (Q6 RP) mounted on the POWER 1 slot of the redundant base unit (Q3 RB/Q6 RB).
The "power supply 2" indicates the redundant power supply module (Q6 RP) mounted on the POWER 2 slot of the redundant base unit (Q3 RB/Q6 RB).
App - 42
(6) Redundant power supply module information
SD1780 to SD1789 are valid only for a redundant power supply system.
The bits are all 0 for a singular power supply system.
• Stores the status of the redundant power supply module
(Q6 RP) with input power OFF in the following bit pattern.
• Stores 0 when the main base unit is not the redundant main base
unit (Q3 RB).
b15 to
SD1780 0
• Stores the failure detection status of the redundant power supply
module (Q6 RP) in the following bit pattern. (The corresponding
bit is cleared to 0 when the input power to the faulty redundant
power supply module is switched OFF after detection of the
redundant power supply module failure.)
• Stores 0 when the main base unit is not the redundant main base
unit (Q3 RB).
b15 to
SD1781
0
• Counts the number of times of momentary power failure of the
power supply 1/2.
• Watches the status of the power supply 1/ 2 mounted on the
redundant main base unit (Q3 RB) and counts the number of
times of momentary power failure.
• When the CPU module starts, the counter of the power supply 1/
2 is cleared to 0.
• If the input power to one of the redundant power supply modules
is turned OFF, the corresponding counter is cleared to 0.
• The counter is incremented by 1 every time the momentary
power failure of the power supply 1/ 2 is detected.
(0 to 65535: When the count exceeds 65535, it starts with 0.)
• Stores 0 when the main base unit is not the redundant main base
unit (Q3 RB).
Explanation
Each bit
0: Input power ON status/ No
redundant power supply
b8 b7 to b0
module
0 1: Input power OFF status
Input power OFF detection status
of power supply 1
Input power OFF detection status
of power supply 2
Each bit
0: Redundant power supply
module failure not
b8 b7 to b0
detected/No redundant power
supply module
0
1: Redundant power supply
module failure detected
(Detectable for redundant
power supply module only)
Failure detection status of
1
power supply 1
Failure detection status of
1
power supply 2
Corresponding
Set by
ACPU
(When set)
D9
S(Every
New
END)
1
1
S(Every
New
END)
S(Every
New
END)
S(Every
New
END)
MELSEC-Q
Applicable
CPU
QnPRH
Remote
App - 42