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Preface
GFK-1527A iii
This manual is a reference to the hardware components, configuration and operation of Enhanced
Hot Standby CPU Redundancy for the Series 90-70 Programmable Logic Controller. This revision
adds information about new redundancy CPUs IC697CGR772 and IC697CGR935, as well as new
features available with Release 7.85 of the product. Also, corrections have been made where
necessary.
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: introduces a method of CPU Redundancy for the Series 90-70
Programmable Logic Controller, which is referred to as Enhanced Hot Standby CPU Redundancy.
Chapter 2. System Components: describes the hardware components for an Enhanced Hot
Standby CPU Redundancy system.
Chapter 3. Configuration Requirements: defines the special configuration requirements of an
Enhanced Hot Standby CPU Redundancy system.
Chapter 4. Normal Operation: describes the operation of an Enhanced Hot Standby CPU
Redundancy system.
Chapter 5. Fault Detection: describes how faults are handled in an Enhanced Hot Standby CPU
Redundancy system.
Appendix A. Cabling: provides a description and diagram of the Series 90-70 multidrop cable for
use in redundancy systems.
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.