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Using a Quantum IEC Hot Standby System
840 USE 106 00 January 2003 115
Using the
Configuration
Extensions
screen
The Configuration Extension offers two check boxes regarding Hot Standby. Since
you are using the IEC environment, check the IEC Hot Standby check box.
When exiting the Configuration Extension dialog with OK, the CHS Hot Standby
loadable is automatically added to the project, but this requires the loadable being
part of the Concept environment (refer to
Loading the Software, p. 112
). There is a
second loadable with the name IHSB added as well. It is needed for the program
transfer from Primary to Standby.
In turn, when the IEC Hot Standby check box is unchecked, the CHS and IHSB
loadables are removed from the project automatically.
The following diagram shows the Configuration Extensions dialog box.
IEC Hot Standby ensures that the Primary and Standby controllers contain identical
IEC applications so that backup is always available in case of a Primary controller
failure. The configuration of the IEC Hot Standby must be done with the Hot Standby
dialog.
Configuration extensions dialog (IEC Hot Standby activated)
Concept