5
REDUNDANT SYSTEM FUNCTIONS
5.6 Online Program Change for Redundancy
5.6.2 Program Change While CPU is Running
5 - 110
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
(j) Consistency check between both systems during online program change
1) File Consistency Check
The file consistency check cannot be performed during online program
change.
Therefore, during online program change, an error will not occur even if the
programs of the control system and standby system CPU modules are
temporarily different.
However, if one of the followings occurs during online program change, an
error may occur during the file consistency check even when online program
change is executed normally.
• Either control system or standby system CPU module is changed from
STOP (PAUSE) to RUN
• Either control system or standby system CPU module is reset, then
unreset (RESET/L.CLR switch is set to the neutral position)
• Either control system or standby system is powered OFF and then ON
• The tracking cable is disconnected and then connected
2) Operating Status Consistency Check
The operation status consistency check cannot be performed during online
program change.
3) Main base unit configuration
The main base unit configuration check cannot be performed during online
program change.
However, if one of the following conditions occurs during online program
change, it will be performed.
• Standby system CPU module is reset and then unreset (RESET/L.CLR
switch is set to the neutral position)
• Standby system is powered OFF and ON
• Tracking cable is disconnected and connected
4) Parameter valid drive settings consistency check
The parameter valid drive settings consistency check cannot be performed
during online program change.
However, if one of the following conditions occurs during online program
change, it will be performed.
• Standby system CPU module resets and clears reset
• Standby system power is turned OFF and ON
• Tracking cable is disconnected and connected
5) Memory Card Setting Status Consistency Check
The memory card setting status consistency check cannot be performed
during online program change.
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