Mitsubishi Electric MELSEC Q Series Reference Manual page 377

APPENDICES
Number Name
Reads module OFF : Ignored
SM551
service interval ON : Read
Number Name
OFF : No redundant
SM Power supply off
1780 detection flag
ON : Redundant power
OFF : No faulty
Power supply
SM
failure detection
1781
flag ON : Faulty redundant
Momentary
power failure
SM
detection flag for
1782
power supply 1
*1 OFF : No momentary
Momentary
ON : Momentary power
power failure
SM
detection flag for
1783
power supply 2
*1
*1: The "power supply 1" indicates the redundant power supply module mounted on the POWER 1 slot of the redundant base unit (Q3 RB/Q6 RB/Q6 WRB).
The "power supply 2" indicates the redundant power supply module mounted on the POWER 2 slot of the redundant base unit (Q3 RB/Q6 RB/Q6 WRB).
*2: This applies to modules with a serial number (first five digits) of "07032" or later.
In multiple CPU systems, all CPU modules used in a system must be the ones with a serial number (first five digits) of "07032" or later.
App - 35
(3) Scan information
Special Relay List
Meaning
• When this relay is turned on, the service interval of the
module specified by SD550 is read to SD551 and
SD552.
(4) Redundant power supply module information
Special Relay List
Meaning
• Turns on when one or more redundant power supply
power supply
modules with input power off are detected.
module with input
• Turns on if any of SD1780 bits is on.
power OFF
• Turns off if all bits of SD1780 are off.
detected
• This relay turns off when the main base unit is not a
redundant main base unit (Q3 RB).
supply module with
• When the multiple CPU system is configured, the flags
input power OFF
are stored only to the CPU No.1.
detected
• Turns on when one or more faulty redundant power
supply modules are detected.
redundant power
• Turns on if any of SD1781 bits is on.
supply module
• Turns off if all bits of SD1781 are off.
detected
• This relay turns off when the main base unit is not a
redundant main base unit (Q3 RB).
power supply
• When the multiple CPU system is configured, the flags
module detected
are stored only to the CPU No.1.
• Turns on when a momentary power failure of the input
power supply to the power supply 1 or 2 is detected one
or more times. After turning on, this relay remains on
even if the power supply recovers from the momentary
power failure.
power failure • Turns off the flags (SM1782 and SM1783) of the power
detected supply 1 and 2 when the CPU module starts.
• When the input power to one of the redundant power
failure detected supply modules turns off, the corresponding flag turns off.
• This relay turns off when the main base unit is not a
redundant main base unit (Q3 RB).
• When the multiple CPU system is configured, the flags
are stored only to the CPU No.1.
Explanation
Explanation
MELSEC-Q
Corresponding
Set by Corresponding
ACPU
(When Set)
M9
U New
Corresponding
Set by Corresponding
ACPU
(When Set)
M9
S
(Each END)
S
(Each END)
New
S
(Each END)
App - 35
CPU
QnA
Qn(H)
QnPH
QnPRH
Rem
CPU
*2
Qn(H)
*2
QnPH
QnPRH
Rem