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Overview of Quantum Hot Standby
28
840 USE 106 00 January 2003
IEC HSBY
IEC HSBY
Architecture
IEC Hot Standby means: Programming an application with the choice of 5 different
IEC compliant languages; FBD, LD, SFC, IL and ST.
1. The IEC HSBY system uses the same hardware architectures as 984 HSBY
system for its basic operations. For example, state RAM data transfer and
switchover control are the same, but there are some differences compared to the
984 HSBY system.
2. PLC firmware upgrade is allowed without shutting down the system with Concept
2.5 or higher. Earlier versions of Concept require shutting down the system to
upgrade PLC firmware.
3. RIO is serviced differently.
4. With Concept 2.5 or higher, it is now possible to download the same application
to Primary and to the Standby controller. The result is that the Hot Standby
system will be fully setup (equalized) with identical applications in both
controllers. Earlier versions of Concept require you to use the UPDATE bush
button (refer to
Using a Quantum IEC Hot Standby System , p. 109
) on the CHS
module in the Standby rack to equalize both controllers. Therefore, the same
application including the configuration will be running in both controllers.
5. There’s no CHS function block used in IEC.