Modicon Quantum Automation Platform Page 2-30 I/O architectures and Hot Standby architectures

2/30 Hot Standby system with Unity Pro software The Unity Hot Standby system is used for the the most demanding applications, in terms of the availability of their control/command system, as no interruption of the process can be tolerated. This system consists of two PLC racks (Primary and Standby) with identical hardware configurations, based on 140CPU67 p 6 p Unity Hot Standby CPUs, linked via a high-speed optical fibre cable (100 Mbps). The Primary PLC executes the application program and controls the I/O, while the Standby PLC remains in the background. If a fault occurs on the Primary PLC, the Standby system automatically switches execution of the application program and control of the I/O to the StandbyPLC. The changeover is performed smoothly at the outputs and is transparent for the process. The Hot Standby system with Unity Pro software increases productivity by minimizing process downtime. Hot Standby system based on remote I/O (RIO) architecture The Hot Standby system based on the remote I/O (RIO) architecture is used for sensitive processes which require an I/O control takeover time within the region of the PLC scan time. As the RIO drops are synchronized with the PLC's CPU scan time, the CPU changeover is carried out smoothly at the outputs, i.e. bumpless . See page 2/39. Ethernet Hot Standby system The Ethernet Hot Standby system is used for processes for which the I/O control time is compatible with Ethernet technology. It is possible to adopt a mixed architecture, combining both RIO distribution on at least one drop and distribution of devices on an Ethernet TCP/IP network. From an operational point of view, client type devices (PLC modules, Human-Machine interfaces, etc.) and Modbus TCP server type devices (Modicon OTB or Momentum distributed I/O, Modicon STB I/O islands, Altivar variable speed drives, etc.) can in fact coexist on a single Ethernet TCP/IP network. As far as Ethernet network topology elements for connection between PLC modules and distributed devices are concerned, it is better to use switches rather than hubs. The topology adopted can be bus or ring type (copper wire or optical fibre), as appropriate With 140CPU6 p 2 pp CPUs, it is also possible to implement the S908 bus and Quantum Ethernet I/O architectures. Hot Standby system based on Profibus DP fieldbus modules This Hot Standby system is based on the use of two PTQ-PDPMV1 communication modules from ProSoft Technology which are used to control the I/O on the Profibus DP fieldbus. See page 2/42. Topologies (continued) Primary PLC Standby PLC RIO drop Optical fibre link C P S C P U C R P RIO drop C P U C R P C P S C P S C R A C R A C P S Hot Standby system and RIO drops Ethernet TCP/IP/Modbus Plus INPUT OUTPUT + INPUT OUTPUT + A B A B Vijeo Citect Optical fibre link Redundant optical fibre Ethernet TCP/IP RIO drops Modicon Quantum Modicon Premium Modicon M340 STB I/O Altivar 71 Momentum I/O Connexium switches C P S C P S C P U C P U C R P C R P N O E N O E Mixed Hot Standby system, Ethernet network and RIO drops Connexium switches Vijeo Citect Primary" PLC Standby PLC Modicon Quantum automation platform I/O architectures Remote I/O (RIO) S908 bus Overview: page 2/6 Presentation: page 2/26 References: page 2/31 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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