Mitsubishi Electric MELSEC iQ-R Series User Manual page 143

Redundant power supply system
The following table lists the special relay areas relating to the redundant power supply system. The information of the
redundant power supply system is stored.
All relays are turned off when the redundant power supply base unit is not used.
No. Name
SM150 Power-off/power supply
voltage drop detection
SM151 Power supply module failure
detection
SM152 Momentary power failure
detection (power supply
module 1)
SM153 Momentary power failure
detection (power supply
module 2)
Data stored Details
Off: Power-on/normal • This relay is turned on when one or more of
power supply voltage the power supply modules whose power has
On: Power-off/voltage drop been shut off or power supply voltage has
detected/power supply dropped (not including a momentary power
module not mounted failure), or one or more of empty slots for the
power supply module are detected.
• This relay is turned on when the factor that
any of 'Power-off/power supply voltage drop
detection status' (SD150) bits turns on
occurs.
• This relay is turned off when all factors that bit
of 'Power-off/power supply voltage drop
detection status' (SD150) turns on are
eliminated.
• This relay is turned off when the main base
unit is not the redundant power supply main
base unit.
Off: Not detected/power-off/ • This relay is turned on when one or more
no power supply faulty power supply modules have been
module detected.
On: Faulty power supply • This relay is turned on when the factor that
module detected any of 'Power supply failure detection status'
(SD151) bits turns on occurs.
• This relay is turned off when all factors that bit
of 'Power supply failure detection status'
(SD151) turns on are eliminated.
• This relay is turned off when the main base
unit is not the redundant power supply main
base unit.
Off: No momentary power • This relay is turned on when one or more
failure detection momentary power failures of the input power
On: Momentary power supply to the power supply module 1 have
failure detected been detected. After this relay is turned on,
the ON state is retained even when the
momentary power failure is stopped.
• This relay is turned off when starting the
remote head module.
• This relay is turned off when the power supply
module 1 turns off.
• This relay is turned off when the main base
unit is not the redundant power supply main
base unit.
Off: No momentary power • This relay is turned on when one or more
failure detection momentary power failures of the input power
On: Momentary power supply to the power supply module 2 have
failure detected been detected. After this relay is turned on,
the ON state is retained even when the
momentary power failure is stopped.
• This relay is turned off when starting the
remote head module.
• This relay is turned off when the power supply
module 2 turns off. This relay is turned off
when the main base unit is not the redundant
power supply main base unit.
Set by (setting timing)
S (Status change)
S (Status change)
S (Status change)
S (Status change)
Appendix 3 List of Special Relay (SM) Areas
A
APPX
141