Mitsubishi QJ71LP21 Reference Manual page 398

APPENDIX
Number Name
OFF: No redundant power
SM Power supply off
ON : Redundant power
1780 detection flag
OFF: No faulty redundant
Power supply
SM
failure detection
1781 ON : Faulty redundant power
flag
Momentary
power failure
SM
detection flag for
1782
power supply 1
*1 OFF: No momentary power
ON : Momentary power
Momentary
power failure
SM
detection flag for
1783
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 - 30
(4) Redundant power supply module information
Meaning
supply module with
• Turns ON when one or more redundant power supply
input power OFF
modules with input power OFF are detected.
detected
• Turns on if any of SD1780 bits is on.
• Turns off if all bits of SD1780 are off.
supply module with • Turns OFF when the main base unit is not the redundant
main base unit (Q3 RB).
input power OFF
detected
• Turns ON when one or more faulty redundant power
power supply module supply modules are detected.
detected • Turns on if any of SD1781 bits is on.
• Turns off if all bits of SD1781 are off.
supply module • Turns OFF when the main base unit is not the redundant
detected main base unit (Q3 RB).
• 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, remains ON ever if the
power supply recovers from the momentary power
failure.
failure detected • Turns OFF the flag (SM1782, SM1783) of the power
supply 1/2 when the CPU module starts.
failure detected • When the input power to one of the redundant power
supply modules turns OFF the corresponding flag turns
OFF.
• This relay turns OFF when the main base unit is not the
redundant main base unit (Q3 RB).
Explanation
MELSEC-Q
Corresponding
Set by Applicable
ACPU
(When Set)
M9
S
(Each END)
S
(Each END)
QnPRH
New
Remote
S
(Each END)
App - 30
CPU