Mitsubishi MELSEC Q Series Programming Manual page 1269

Number Name Meaning
Power supply Power supply
failure failure
SD1781
detection detection
status status
Momentary
Momentary
power failure
power failure
detection
detection
SD1782
counter for
count for
power supply
power supply
*1
1
1
Momentary
Momentary
power failure
power failure
detection
detection
SD1783
counter for
count for
power supply
power supply
*1
2
2
*1 The "power supply 1" indicates the redundant power supply module mounted on the POWER 1 slot of the redundant
base unit (Q38RB/68RB/Q65WRB).
The "power supply 2" indicates the redundant power supply module mounted on the POWER 2 slot of the redundant
base unit (Q38RB/68RB/Q65WRB).
*2 The module whose first 5 digits of serial No. is "07032" or later. (However, for the multiple CPU system configuration, this
applies to all CPU modules whose first 5 digits of serial No. are "07032" or later.)
*3 The module whose first 5 digits of serial No. is "10042" or later.
Explanation
• This register stores failure detection status of the redundant
power supply module (Q64RP) in the following bit
pattern.(After a failure is detected on a redundant power
supply module, the bit corresponding to the failed module
turns to "0" upon turning off the module.)
Failure detection Failure detection
status of power status of power
1 1
supply 2 supply 1
b15 to b8 b7 to
to to
SD1781
• When the main base unit is not the redundant power main
base unit (Q38RB), "0" is stored.
• When configuring multiple CPU, the status is stored to 1st
CPU module.
• Counts the number of times of momentary power failure of
the power supply 1/2.
• Monitors the status of the power supply 1/ 2 mounted on the
redundant power main base unit (Q38RB) and counts the
number of times of momentary power failure.
Status of power supply 1/power supply 2 mounted on the
redundant extension base unit is not monitored.
• 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 one upon momentary power
failure on the power supply 1 or 2.(The counter repeats
increment and decrement of the value; 0 → 32767 → - 32768 →
0 .(The value is displayed within the range of 0 to 65535 in
the system monitor screen of programming tool.))
• Stores 0 when the main base unit is not the redundant power
main base unit (Q38RB).
• When configuring multiple CPU, the status is stored to 1st
CPU module.
Set by
(When Set)
Each bit
0: Redundant power supply
module failure not
detected/No redundant power
supply module
b0
1: Redundant power supply
module failure detected
(Detectable for redundant
power supply module only)
Main base unit
1st extension base
:
7st extension base
Main base unit
1st extension base
:
7st extension base
(Every END
processing)
Corres-
Corres-
ponding
ponding
ACPU
CPU
D9
*2
Qn(H)
S
*2
QnPH
New
QnPRH
*3
QnU
App-261
8
8
8
8
A
6
7
8