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CLP – Redundant Citrine

The Citrino PLC redundant automation system aims to reduce the risk of production loss by operating two systems in parallel, tolerating the failure of one of the two systems. If any element of the system fails, the whole set is deactivated and the Standby system takes over, maintaining the system operation without interruption. Control SwitchOver possibilities: Power failure, Ethernet cable (link) failure, PROFIBUS-DP cable failure, ModBus-RTU cable failure, PROFIBUS module (MFI-PBM-2) failure, CPU (MCPU-2) failure, force SwitchOver by software

Description

Redundancy Architecture:

Every architecture proposed as Redundant System using Citrino PLC, must necessarily consist of two identical sets of equipment at the control level, i.e., if the primary system has 1 Source (MPS-1RD), 1 CPU (MCPU-2), 1 Profibus Module (MFI-PBM-2), the secondary system must have the same equipment both in quantity and identical firmware versions. The following is a typical Profibus-DP redundancy architecture.

The descriptions below are related to an application example for a redundant system.
Supervision System: connected to the Citrino redundant system via OPC Redundant servers.
Fiber Optic: the fiber optic communication between the two systems allows the exchange of information between the two CPUs (Synchronism).
Redundant System: in the example architecture presented, one MFI-PBM-2 (Profibus master) was used in each of the systems.
Profibus Network Topology: there are several possible network topologies on Profibus, from a simple in-line topology as shown in the previous example, to applications with redundant ring.

Redundancy Technical Specifications:

  • MCPU-2: Contemplates all the features of the previous version (MCPU-1) with the addition of redundancy features. Requires BMCPU-2 base.
  • MPS-1RD: Contains all the features of the previous version (MPS-1) with the addition of power failure detection at 200 V/second (maximum load). Requires BMPS1-RD base.
  • MFI-PBM-2: It contemplates all the features of the previous version (MFI-PBM) with the addition of redundancy features. Requires BMFI-PBM base

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