APPX
Appendix 5 List of Special Register Areas
875
A
System information (Process CPU)
The following is the list of special register areas relating to the system information.
Redundant function
The following is the list of special register areas relating to the redundant function.
No. Name Data stored Details Set by
(setting
timing)
CPU
SD1622 Process CPU
operation mode
Process CPU
operation mode
This register stores the operation mode of the Process CPU
80H: Process mode
81H: Redundant mode
S (Initial) RnP
No. Name Data stored Details Set by
(setting
timing)
CPU
SD1642 BACKUP/SEPARATE
LED flashing cause
BACKUP/SEPARATE
LED flashing cause
Flashing cause of BACKUP/SEPARATE LED is stored using the
following bit pattern.
Corresponding bits to each cause turns on.
b1: Tracking communications disabled
b3: Stop error of the standby system
b4: Operating status mismatch between both systems
b5: Memory copy being executed
b6: Online change being executed
b7: A failure of a network module detected on the standby system
b8: System switching being executed
b9: A redundant function module being changed online
b10: System switching disabled on the standby system by using the
DCONTSW instruction
b14: Safety operation mode mismatch between both systems
b15: A failure of safety tracking data detected
• 0 is stored as initial value.
• When the multiple causes occurred at the same time, bits
corresponding to each cause turn on simultaneously. If the
tracking communications are disabled or the redundant function
module is being changed online, the other causes turn off.
• When the redundant function module in the other system is being
changed online, "Tracking communications disabled" is stored in
own system.
• Even if a cause of the system switching failure has occurred, the
system is switched when the system switching causes which
have higher priority, such as power-off or reset of the CPU
module, have occurred. ( Page 447 Execution availability of
system switching)
S (Status
change)
RnP
RnPSF
SD1643 System switching
cause
System switching
cause occurred in
own system (normal/
abnormal systems
witching)
Stores the system switching cause occurred in own system. The
system switching cause is stored in this register even if the systems
cannot be switched by a cause of system switching failure. This
register is initialized with 0 when the CPU module is powered off
and on or is reset.
0: Initial value (the control system never been switched)
1: Power-off, reset, hardware failure
2: Stop error
3: System switching request from a network module
16: System switching request by using the SP.CONTSW instruction
17: System switching request using an engineering tool
When the system is switched upon the power-off or reset of the
CPU module in the control system, 1 is not stored in SD1643 of the
new standby system.
S (At system
switching)
RnP
RnPSF
b15b14 b1b2b3b4b5b6
b0
b8b9b10b11
b7
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