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GFK-0827
Appendix A Redundancy Alternatives
Redundancy Alternatives
There are several redundancy alternatives for the Series 90-70 Programmable Logic
Controller. These redundancy options consist of implementation of the redundancy
feature through a user logic program or through a redundancy product which consists of
both hardware and software. The type of redundancy product alternative that is used is
also referred to as the Control Strategy, which must be defined for configuration
purposes. Redundancy alternatives are:
Hot Standby Application Logic;
Hot Standby Product plus Application Logic;
Hot Standby Product (described in this manual);
ESD (Emergency Shutdown System) Duplex Application Logic;
ESD Duplex and Triplex GMR (Genius Modular Redundancy) (see GFK-0787, Genius
Modular Redundancy User’s Manual).
For your information the following Redundancy Selection Guide is provided which lists the
features desired through implementation of a redundancy system followed by a table
which further describes these redundancy options.
Note
Note that the redundancy option described in this
manual is the Hot Standby Product.