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Using a Quantum IEC Hot Standby System
114
840 USE 106 00 January 2003
Controlling the Hot Standby System by Configuration Extension
Configuration
Extension
Use the Hot Standby Concept configuration extension screen as follows:
Specify the parameters in the Hot Standby command register
Define a nontransfer area to help reduce scan time
The parameters in the configuration screens are applied by the controllers at startup.
You can change the settings/behavior of the IEC Hot Standby system after already
having downloaded the configuration to the controller. Do this either by setting or
resetting the particular bits of the Hot Standby command register or by using the Hot
Standby specific EFBs of the "System" library.
IEC Logic in a
Hot Standby
System
In the Concept 2.1/2.2 Hot Standby system, there is no logic executed in the
Standby controller. This is different from the 984 Hot Standby system, where the
Standby controller executes the logic of segment 1.
In the Concept 2.5 Hot Standby system, the Standby controller executes section 1
logic; this is similar to the way segment 1 is handled in a 984 Hot Standby System.
Section 1 may contain logic for diagnostic and optional Hot Standby functions, such
as battery coil status. Do not program I/O control logic in section 1.
Note: If the Hot Standby system is later stopped and then restarted, the
parameters specified in the configuration extension screens go back into effect.