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840 USE 106 00 January 2003 13
1
Overview of Quantum Hot
Standby
At a Glance
Purpose This chapter presents a brief overview of the Hot Standby system, including a
description of Primary and Standby control, components, the Hot Standby module,
LEDs and switches, modes of operation, 984 and IEC HSBY, and the application
size.
Throughout the rest of this book the Quantum Hot Standby system is referred to as
HSBY.
An HSBY system is based on two identically configured programmable logic
controllers linked to each other and to the same remote I/O network. If one controller
fails, the other assumes control of the I/O system.
What’s in this
Chapter?
This chapter contains the following sections:
Section Topic Page
1.1 Control 15
1.2 Operation 21
1.3 Cabling 23
1.4 984 HSBY and IEC HSBY 26