Redundant Function - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Redundant function

The following is the list of special relay areas relating to the Redundant function.
No. Name
SM1630 Operation mode
identification flag
SM1632 System A identification
flag
SM1633 System B identification
flag
SM1634 Control system judgment
flag
SM1635 Standby system
judgment flag
SM1636 Previous control system
identification flag
SM1637 System switching
detection (standby
system to control
system)
SM1643 ON for only one scan
after system switching
(standby system to
control system)
SM1644 ON for only one scan
after system switching
(control system to
standby system)
SM1645 System switching
request from a network
module
SM1646 System switching by a
user
Data stored Details
Off: Redundant system in This relay turns on while a redundant system
backup mode, stand- is operating in separate mode.
alone system
On: Redundant system in
separate mode
Off: System B, system not • This relay distinguishes between the
determined system A and the system B.
On: System A • The flag status does not change even if
tracking cables are disconnected.
Off: System A, system not • This relay distinguishes between the
determined system A and the system B.
On: System B • The flag status does not change even if
tracking cables are disconnected.
Off: Standby system, • This relay indicates operating status of the
system not determined CPU module. The flag is stored in each
On: Control system system when an initial processing is
performed (including when the system is
determined while waiting for the start-up of
the other system) and when a system
switching is completed.
• The flag status does not change even if
tracking cables are disconnected.
Off: Control system, system • This relay indicates operating status of the
not determined CPU module. The flag is stored in each
On: Standby system system when an initial processing is
performed (including when the system is
determined while waiting for the start-up of
the other system) and when a system
switching is completed.
• The flag status does not change even if
tracking cables are disconnected.
When the previous control system is the
system B, this relay turns on during one scan
ON
1 scan
in the system A, following the RUN state after
OFF
both systems were powered on or the CPU
module is reset.
Off: Not detected This relay turns on after the standby system
On: Detected has been switched to the control system.
• This relay turns on during one scan after the
standby system was switched to the control
ON
1 scan system.
OFF
• This relay can be executed only in a scan
execution type program.
• This relay turns on during one scan after the
control system was switched to the standby
ON
system.
1 scan
OFF
• This relay can be executed only in a scan
execution type program.
Off: System switching • This relay turns on when a system
request not issued switching request from a network module is
On: System switching issued.
request issued • The module that issued system switching
can be checked in SD1645.
• This relay turns off when all bits of SD1645
are off.
Off: Disabled • This relay stores whether to enable system
On: Enabled switching operation by a user using an
engineering tool or the SP.CONTSW
instruction.
• Initial value is off: System switching by a
user is prohibited.
Set by (setting timing)
S (Every END)
S (Initial)
S (Initial)
S (Initial/Status change)
S (Initial/Status change)
S (Every END)
S (Status change)
S (Every END)
S (Every END)
S (Every END)
U
Appendix 4 List of Special Relay Areas
CPU
RnP
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
A
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
RnP
RnPSF
APPX
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