Mitsubishi Electric Q13UDVCPU - Page 489

487
APPENDICES
A
Appendix 2 List of Special Relay Areas
(14)Process control instruction
(15)Redundant system (host system CPU information
*1
)
The special relay (SM1510 to SM1599) is valid only for redundant systems. All bits are set to off for stand-alone
systems.
Number Name Meaning Explanation
Set by (When
Set)
Correspondi
ng ACPU
M9
Correspondi
ng CPU
SM1500
Hold mode
OFF: No-hold
ON: Hold
Specifies whether or not to hold the
output value when a range over occurs
for the S.IN instruction range check.
UNew
QnPH
QnPRH
SM1501
Specifies whether or not the output value
is held when a range over occurs for the
S.OUT instruction range check.
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Corresponding
CPU
SM1510 Operation mode
OFF: Redundant
system backup
mode, stand-
alone system
ON: Redundant
system separate
mode
This relay is on while the system is operating
in the separate mode.
S (Every
END
processing)
New QnPRH
SM1511
System A
identification flag
• Distinguishes between system A and system B.
• The flag status does not change even if the tracking cable is
disconnected.
S (Initial) New QnPRH
SM1512
System B
identification flag
SM1513
Debug mode
status flag
OFF: Not in debug
mode
ON: Debug mode
This relay is on while the system is operating
in the debug mode.
S (Initial) New QnPRH
SM1515
Control system
judgment flag
• Indicates operation system status.
• The flag status does not change even if the tracking cable is
disconnected.
S (Status
change)
New QnPRH
SM1516
Standby system
judgment flag
SM1517
CPU module
startup status
OFF: Power supply on
startup
ON: Operation system
switch start up
Turns on when the CPU module is started up
by the system switching (switching from the
standby system to the control system).
Remains OFF when the standby system is
switched to the control system by a power-
ON startup.
S (Status
change)
New QnPRH
SM1518
Standby system
to control system
switching status
flag
• This relay turns on during one scan after
the standby system was switched to the
control system.
• This relay can be used only in a scan
execution type program.
S (Every
END
processing)
New QnPRH
SM1519
Previous Control
System
Identification
Flag
When the previous control system is System
B, this relay turns on during one scan in
System A, following the RUN state after both
Systems A and B were simultaneously turned
on or were reset.
S (Every
END
processing)
New QnPRH
SM1511
SM1512
ON
OFF
System A
OFF
System B
ON
OFF
OFF
If TRK. CABLE ERR.
(error code: 6210) occurred (Unknown)
SM1515
SM1516
ON
OFF
Control
system
OFF
Standby
system
ON
OFF
OFF
If TRK. CABLE ERR.
(error code: 6210) occurred (Unknown)
ON
OFF
1 scan
ON
OFF
1 scan