Mitsubishi Electric Q26UD(E)HCPU User Manual page 584

(20)Redundant system (other system CPU information
The special register (SD1600 to SD1650) is valid when the redundant system is in backup mode and is invalid in
separate mode. The special register (SD1651 to SD1690) is valid when the redundant system is in backup mode
or in separate mode. All bits in SD1600 to SD1690 are set to "0" for stand-alone systems.
Number Name Meaning
System error System error
SD1600
information information
System System
SD1601 switching switching
results results
System System
switching switching
SD1602 dedicated dedicated
instruction instruction
parameter parameter
Other
system Diagnostic
SD1610
diagnostic error code
error
Other
system Diagnostic
SD1611
diagnostic error
to
error occurrence
SD1613
occurrence time
time
582
Explanation
• When an error is detected by the redundant system error
check, the bit corresponding to the error turns on. The bit
turns off when the error is cleared.
b15 b2 b1 b0
SD1600 Fixed to 0
• If any of b0, b1, b2 and b15 is on, the other bits are off.
• In the debug mode, b0, b1, b2 and b15 are all off.
Reason(s) for system switching is stored.
• When a system is switched, the reason for system switching
is stored in SD1601 of both systems.
• This register is initialized with zero (0) stored when the
system is powered on from off or is reset.
• The following shows the values stored in this register.
0: Initial value (control system has never been switched)
1: Power-off, reset, H/W failure, or watchdog timer error
2: Stop error (except for watchdog timer error)
3: A system switching request from network module
16: Control system switching instruction
17: System switching request from a programming tool
*1 When the system is switched upon the power-off or
reset of the control system, "1" is not stored in SD1601
of the new standby system.
• When a system is switched by the SP.CONTSW instruction,
the argument of the instruction is stored. (The argument is
stored in SD1602 of both systems at the system switching.)
• SD1602 is only valid when "16" is stored in SD1601.
• SD1602 is updated only when a system is switched by the
control system switching instruction.
• The code of the error occurred in the other system is stored.
• The value in SD0 of the CPU module on the other system is
reflected.
• The date and time of the diagnostics error occurred in the
other system are stored.
• Data format is the same as SD1 to SD3.
• The values in SD1 to SD03 of the CPU module on the other
system are reflected.
*1
)
Set by
(When Set)
Each bit
0: OFF
1: ON
Tracking cable is not
connected or damaged
Power-OFF, reset,
watchdog timer error or
hardware failure occurred
S (Every
in other system
END
Other system stop error
processing)
(except watchdog timer
error)
Bit turns on when failing to
connect with other system.
The following causes are
shown below:
Tracking H/W failure
Host system WDT error
Cannot recognize other
system therefore causing
error
S (when
*1
system is
switched)
S (when
system is
switched)
S (Every
END
processing)
S (Every
END
processing)
Corresponding
Corresponding
host CPU
CPU
*2
SD

QnPRH

QnPRH
 QnPRH
SD0 QnPRH
SD1 to SD3 QnPRH