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It is very difficult to optimize the dead time due to the great diversity of load on a system. However, it is possible to study each type of load separately and thereby be able to define a typical dead time.

Description:

Document Scope This Quick Start guide offers the essential facts needed to start using a Modicon 

Quantum with Unity Hot Standby system consisting of the Unity Pro software and 

the Modicon Quantum Hot Standby with Unity 140 CPU 671 60. This guide 

augments the Modicon Quantum Hot Standby with Unity User Manual. Users of 

legacy Quantum Hot Standby systems should note that significant differences exist 

between Unity and legacy systems.

Hot Standby systems offer fault-tolerance through constantly available redundant 

automation control systems.

Note: Software Requirements

Required to use a Quantum Modicon Hot Standby with Unity system:

Unity Pro 2.0 or higher

CRA firmware: Release 1.25 or higher

Note: Who should use this document?

Anyone who is starting to use a Hot Standby system.

You should have knowledge of programmable logic controllers (PLCs/

controllers). Familiarity with automation controls is expected.

You should possess a working knowledge of the Unity Pro software. Familiarity 

with Concept, ProWORX, or Modsoft will help.

Note: Nomenclature

This guide uses both the word, controller, and the acronym, PLC. Both refer to a 

programmable logic controller like the 140 CPU 671 60.

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