Mitsubishi Q12PRHCPU - Tracking Mode

5
REDUNDANT SYSTEM FUNCTIONS
5.5 Tracking Function
5.5.7 Tracking Mode
5 - 90
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
5.5.7 Tracking Mode
Tracking mode determines processing when a new tracking request occurs before the
previous tracking processing is completed.
(If the previous tracking has been completed while the control system CPU module is
executing the END processing, the next tracking will be initiated.)
There are 2 types of tracking modes:
• Synchronous tracking mode
• Asynchronous tracking mode
(1) Tracking Mode For Each Operation Mode and System Operating Status
Tracking mode is determined by the operation mode and system operating status as
shown in Table5.52.
* 1: Tracking mode will change to asynchronous mode when the backup mode is changed to separate
mode.
* 2: Tracking mode will change to synchronous mode within maximum 150ms after the separate mode
is changed to backup mode.
* 3: When the special relay "Device memory tracking during RUN write (SM1710)" is turned on to
execute tracking during online program change, tracking during online program change is
executed in the asynchronous tracking mode. ( Section 5.6.2)
Table5.52 Tracking Mode by Operation Mode and System Operating Status
Operating Status Operation Mode
Control
System
Standby
System
Backup Mode Separate Mode
Backup Mode to
Separate Mode
Separate Mode to
Backup Mode
RUN
RUN
Synchronous
tracking mode
*3
Asynchronous
tracking mode
Synchronous to asynchronized
tracking mode
*1
Asynchronous to synchronized
tracking mode
*2
STOP
PAUSE
Asynchronous
tracking mode
Asynchronous to asynchronized
tracking mode
Asynchronous to asynchronized
tracking mode
Stop Error
STOP
PAUSE
RUN
STOP
PAUSE
Stop Error
Stop Error
RUN
–––
STOP
PAUSE
Stop Error