ProSoft Technology PTQ-104C - Manual (Page 82)

Hot Standby Support 49TPTQ-104C ♦ 48TQuantum Platform
12TUser Manual 47TIEC 60870-5-104 Client
7.1 Hot Standby Overview
This section describes the PTQ-104C IEC 870-5-104 Client module
specifications and startup support for Modicon Quantum Hot Standby system.
A Modicon Quantum Hot Standby with Unity system can be used when downtime
cannot be tolerated. Hot standby systems deliver high availability through
redundancy. A hot standby system consists of two identical configurations.
 Modicon Quantum 140 CPU 671 60
 Modicon Quantum Power Supply Module
 Modicon Quantum RIO Head
 ProSoft Technology PTQ-104C module hardware version 1.05 or higher
 Modicon Optional Modules (NOE, NOM)
One of the 140 CPU 67160s acts as the Primary controller and the other acts as
the Standby controller. The Primary controller runs the application program and
operates the remote I/O.
Note: The Modicon Quantum RIO Head is required even if the Remote I/O will not be used.
This feature is enabled by clicking the Enable Hot Standby button in the
Choose Module Type window.
7.1.1 Identical Configurations
Two backplanes are configured with identical hardware and software. One of the
programmable logic controllers (PLCs) functions as the Primary controller and
the other as a Standby controller, and either controller can be put in the Primary
state, but the other must be in the Standby state or offline.
Page 82 of 136 ProSoft Technology, Inc.
March 4, 2013