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APPENDICES
A
Appendix 3 Special Relay (SM) for MELSECNET/H (MELSECNET/10 Mode) Remote I/O Station
(4) Redundant power supply module information
*1 The "power supply 1" indicates the redundant power supply module mounted on the POWER 1 slot of the redundant
base unit (Q3RB/Q6RB/Q6WRB).
The "power supply 2" indicates the redundant power supply module mounted on the POWER 2 slot of the redundant
base unit (Q3RB/Q6RB/Q6WRB).
*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.
No. Name Meaning Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Corresponding
CPU
SM1780
Power supply
off detection
flag
OFF: No redundant
power supply
module with
input power
OFF detected
ON: Redundant
power supply
module with
input power
OFF detected
• Turns on when one or more redundant
power supply modules with input power off
are detected.
• Turns on if any of SD1780 bits is on.
• Turns off if all bits of SD1780 are off.
• This relay turns off when the main base unit
is not a redundant main base unit (Q3RB).
• When the multiple CPU system is
configured, the flags are stored only to the
CPU No.1.
S
(Every END
processing)
New
Qn(H)
*2
QnPH
*2
QnPRH
Rem
SM1781
Power supply
failure
detection flag
OFF: No faulty
redundant
power supply
module
detected
ON: Faulty
redundant
power supply
module
detected
• Turns on when one or more faulty redundant
power supply modules are detected.
• Turns on if any of SD1781 bits is on.
• Turns off if all bits of SD1781 are off.
• This relay turns off when the main base unit
is not a redundant main base unit (Q3RB).
• When the multiple CPU system is
configured, the flags are stored only to the
CPU No.1.
SM1782
Momentary
power failure
detection flag
for power
supply 1
*1
OFF: No
momentary
power failure
detected
ON: Momentary
power failure
detected
• 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.
• Turns off the flags (SM1782 and SM1783) of
the power supply 1 and 2 when the CPU
module starts.
• 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 a redundant main base unit (Q3RB).
• When the multiple CPU system is
configured, the flags are stored only to the
CPU No.1.
SM1783
Momentary
power failure
detection flag
for power
supply 2
*1