Mitsubishi Electric MELSEC iQ-R Series User Manual page 650

No. Name
SM152 Momentary power failure
detection (power supply
module 1)
SM153 Momentary power failure
detection (power supply
module 2)
SM154 Invalid power supply
module
APPX
648
Appendix 4 List of Special Relay Areas
Data stored
Off: Not detected
On: Detected
Off: Valid/power-off/no power
supply module
On: Invalid
Details
• This relay 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.
• This register monitors the status of the power supply
module mounted on the main base unit and counts the
number of momentary power failures.
• This relay turns off the flags (SM152 and SM153) of the
power supply 1 and 2 when the CPU module starts up.
• When one of the two power supply modules is powered off,
this relay turns off the corresponding flag to one powered
off.
• In a multiple CPU system, the flags are stored only to the
CPU No.1.
• This relay turns on when one or more invalid power supply
modules is detected on the redundant power supply base
unit or a redundant extension base unit.
• This relay turns on if a factor to turn on any bits of SD154
have been occurred.
• This relay turns off if all the factors to turn on any bits of
SD154 have been removed.
• In a multiple CPU system, the flags are stored only to the
CPU No.1.
• In a redundant system with redundant extension base unit,
if an invalid power supply module is detected on an
extension base unit, the on/off state is stored only in the
CPU module of the control system, but not stored in the
CPU module of the standby system.
Set by (setting
timing)
S (Status change)
S (Status change)
S (Status change)