ProSoft Technology PTQ-PDPMV1 - Manual (Page 186)

Hot Standby Support PTQ-PDPMV1 ♦ Quantum Platform
User Manual PROFIBUS DP Master Network Interface Module for Quantum
Page 186 of 306 ProSoft Technology, Inc.
August 12, 2014
7.1 Hot Standby Overview
This section describes the PTQ-PDPMV1 PROFIBUS DP Master module
specifications and startup support for Modicon Quantum Hot Standby system.
Use a Modicon Quantum Hot Standby with Unity system and PROFIBUS 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-PDPMV1 module hardware version 1.13 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.
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.
7.1.2 Primary and Standby Controllers
The Primary controller executes the application program, controls the remote I/O,
and updates the Standby controller after every scan (program cycle). If the
Primary controller fails, the Standby controller takes control within one scan. To
determine if the Primary controller failed note controller’s status displayed in the
HE CPU LCD screen and the RIO Head’s status displayed by the RIO Head’s
LEDs.
The Standby controller does not execute the full application program but only the
first section, and the Standby controller does not control the remote I/O but
checks out the availability of the Modicon Quantum Hot Standby with Unity
equipment.
Note: For additional information on Quantum Hot Standby support, refer to the Unity Pro Hot
Standby User Guide.