Introduction Provided the corresponding bit position 13 has been set to 1 (Bit 13 is now
%SW60.3 in IEC convention), the Quantum Hot Standby with Unity System will
remain "coupled" in case a logic mismatch occurs.
In these conditions, let's examine the operations sequence that would have to be
conducted, starting from a coupled system, to get a modified coupled system.
Data / Code
Changes_
Primary
Up to a certain amount, the target modifications done on the application project can
presumably involve any change, deletion, or addition, either to data or code. These
modifications should not involve the controller's configuration, however.
Considering that the update transfer may only occur from Primary to Standby, and
considering that only the Primary will execute the whole program, the modifications
will usually occur on the Primary.
Per default: Modifications done on the Primary Unit:
Make the required changes on code and/or data
Note that a code section will switch to a blank background color as the first
change is done on that section
Run the "Build | Build Project" menu command
Provided the modifications induced no error, the background color of the modified
sections turns back to grey.
Execute a transfer from modified Primary to Standby, either from the Keypad, or
from the control Register - %SW60 - (%SW60.5 asks for this transfer when set to
'1')
Data / Code
ChangesStandby
Alternative: Modifications done on the Standby Unit:
Make the required changes on code and/or data
Note that a code section will switch to a blank background color as the first
change is done on that section
Run the "Build | Build Project" menu command
Provided the modifications induced no error, the background color of the modified
sections turns back to grey.
In order to be able to execute the update transfer, execute a switchover,
switching the Primary unit to Offline first, then to Run state. This switchover may
be asked for from the keypad, or by mean of the control register on the Primary
Unit.
Execute a transfer from (new) modified Primary to (new) Standby, either from the
Keypad, or from the control Register - %SW60 - ((%SW60.5 asks for this transfer
when set to '1')
