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GFK-0827
Preface
This manual is a reference to the hardware components, configuration and operation of
the Hot Standby CPU Redundancy system for the Series 90 -70 Programmable Logic
Controller. This redundancy system is one of several redundancy alternatives that may
be incorporated into a Series 90-70 Programmable Logic Controller system (see
Appendix A).
The information in this manual is intended to supplement the information contained in
the system installation, programming, and configuration information found in the
manuals listed below under ”Related Publications”.
Content of this Manual
Chapter 1. Introduction: describes the basic system features of the Hot Standby CPU
Redundancy system Control Strategy, and provides an overview of system components,
configuration, and operation.
Chapter 2. Components: describes the hardware components for the Hot Standby CPU
Redundancy system.
Chapter 3. Configuration: describes the special configuration requirements of a Hot
Standby CPU Redundancy system and provides an example of system configuration.
Chapter 4. Operation: describes the operation of a Hot Standby CPU Redundancy
system, fault detection and actions taken, and the on-line repair of a failed component.
Appendix A. Redundancy Alternatives: describes the redundancy alternatives for the
Series 90-70 Programmable Logic Controller for those readers not familiar with those
alternatives.
Related Publications
For more information, refer to these publications:
Genius I/O System User’s Manual (GEK-90486-1). Reference manual for system
designers, programmers, and others involved in integrating Genius I/O products in a
PLC or host computer environment. This book provides a system overview, and
describes the types of systems that can be created using Genius products. Datagrams,
Global Data, and data formats are defined.
Genius Discrete and Analog Blocks User’s Manual (GEK-90486-2). Reference manual for
system designers, operators, maintenance personnel, and others using Genius discrete
and analog I/O blocks. This book contains a detailed description, specifications,
installation instructions, and configuration instructions for discrete and analog blocks.
Series 90-70 PLC Installation Manual (GFK-0262). This book describes the hardware
components in a Series 90-70 PLC system, and provides the details of system installation.
Logicmaster 90-70 Programming Software User’s Manual (GFK-0263). A programming
software user’s manual for system operators and others using the Logicmaster 90-70
software to program, configure, monitor, or control a Series 90-70 PLC system.