C300 Redundancy Operation; Description - Honeywell C300 User Manual

8. C300 Redundancy operation

This chapter describes the C300 Controller redundancy. The following table provides the
sections covered in this chapter. Click the topic to view it.
Redundancy description
Redundancy configuration restrictions
Partner (controller) compatibility
Synchronization states
Redundancy param eters
Conditions that result in a loss of sync
Switchover
Conditions that result in a switchover
Redundancy history
C300 redundancy-related notifications
Controller redundancy specifications
8.1

Description

The goal of controller redundancy is to improve the availability of the controller to
perform its assigned control functions. This is performed by providing a pair of C300
Controllers (Primary and Backup) so a component failure in one controller switches the
handling of the assigned control functions to the other controller. In this redundant
arrangement, the active or primary controller is considered to have a redundant partner or
backup controller which is available to take over control functions of the primary
controller in the event of a switchover. This is considered a dual redundant system, which
is characterized by the following two main redundancy states.

Primary - Refers to the controller executing the assigned control functions.

Backup or Secondary - Refers to the controller in some state of readiness to assume
the responsibilities of the Primary.
R500
April 2017
Topic
Series 8 C300 Controller User's Guide
Honeywell
207