5
REDUNDANT SYSTEM FUNCTIONS
5.5 Tracking Function
5.5.3 Tracking Data
5 - 80
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR
STARTING UP A
REDUNDANT SYSTEM
5
REDUNDANT SYSTEM
FUNCTIONS
6
REDUNDANT SYSTEM
NETWORKS
7
PROGRAMMING
CAUTIONS
8
TROUBLESHOOTING
(2) Automatic Tracking Data
Automatic tracking data is the data that the redundant CPU tracks regardless of the
redundant parameter tracking settings.
The data settings cannot be changed by changing the redundant parameter tracking
settings .
This applies to the SFC data, PID control instruction data. some special relays and
special registers.
(a) SFC data
SFC data is necessary for continuing the SFC program.
SFC data is tracked when using the SFC program in the backup Mode.
(b) PID control instruction data
PID control instruction data to be automatically tracked is the data that is specified
for PID control by the PIDINIT and S.PIDINIT instructions.
The PID control data is tracked when executing the PIDINIT and S.PIDINIT
instructions in the backup mode.
(c) Special Relays
Table5.46 shows the automatically transferred special relays.
Special relays are only transferred in Backup Mode.
Table5.46 Automatically Transferred Special Relays
Number Name Number Name
SM90 to SM99
Startup watchdog timer for step transition
(Emabled only when SFC program exists)
SM701 Number of output characters selection
SM202 LED OFF command SM702 Search method
SM206 PAUSE enable coil SM703 Sort order
SM210 Clock data set request SM710 CHK instruction priority ranking flag
SM213 Clock data read request SM715 EI flag
SM250 Max. loaded I/O read SM722 BIN/DBIN instruction error disenabling flag
SM254 All stations refresh command SM774
PID bumpless processing (for complate
derlvative)
SM255 to SM257 MELSECNET/H module 1 information SM775
Selection of link refresh processing during COM
instruction execution
SM260 to SM262 MELSECNET/H module 2 information SM776 Enable/disable local device at CALL
SM265 to SM267 MELSECNET/H module 3 information SM777 Enable/disable local device in interrupt program
SM270 to SM272 MELSECNET/H module 4 information SM794
PID bumpless processing (for incomplate
derlvative)
SM321 Startup/stop SFC program
SM1500
SM1501
Hold mode (S.IN, S.OUT instruction)
SM322 SFC program start status
SM1520 to
SM1583
Data tracking block specefication trigger
SM323
Resence/absence of Continuous transition for
entire blocks
SM1591
Standby system error detection disable flag at
system switching
SM325 Output mode at block stop SM1592 Enable/disable user system switching
SM326 SFC device clear mode SM1598
Copy contents of standard ROM during memory
copy
SM327 Output during end step execution SM1649 Standby system cancel error flag
SM402 After RUN, ON for 1 scan only SM1709
Disable prohibition of system switching during
online program change
SM403 After RUN, OFF for 1 scan only
SM1710
Transfer tracking data during online program
change enable flag
SM551 Reads module service interval
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