CPUs for redundant remote I/O and control
An
Omniflex product story
Edited by the Engineeringtalk editorial team
Apr 11, 2006
High availability system constructed by combining two identical CPUs, each with its own power supply and base, to create independent primary and secondary master controllers.
The Maxiflex P3-R CPUs are for redundant remote I/O and control applications, where high availability is required in hot standby configurations.
The high availability system is constructed by combining two identical P3-R CPUs, each with its own power supply and base, to create independent primary and secondary master controllers.
These two master controllers are connected to common remote I/O bases, and to the Scada system to create a hot standby controller configuration with common I/O.
Both controllers consume the common input data from the remote I/O bases, but only the active controller controls the outputs and communicates with the supervisory computer.
The secondary controller continuously monitors the health of the master controller, and if a failure is detected the secondary controller takes over.
Both controllers stay synchronised through a separate communications link between them.
The monitoring and switch-over between controllers occurs completely transparently to the Scada computer.
The secondary controller can either run a program identical to the primary controller, or it can run an independent program designed to bring the process to a safe state.
The P3-R can be programmed in one or more of the standard IEC61131-3 programming languages (all five languages plus flow chart and PID auto tune) using the Omniflex Isagraf programmer's workbench, although conventional remote I/O systems can be implemented without the need for any programming.
The P3-R CPU includes an inter-network routing capability for retrieving data from the corners of the factory in large, geographically spread-out installations.
This allows many dissimilar network types to be linked to create a seamless factory intranet, often without the need to lay special network cabling.
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