ABB Server control board PFSK165 3BSE027778R1 VP74201-933CW07



One of the important methods of fault detection is to compare the communication messages at the external interface of a module. The message will only leave the controller if both controllers agree on the message to be sent (matching bits by bits). Once a fault is detected, both modules run self-diagnostics to determine which module is defective. The defect-free module then takes control without affecting normal system operation. Splitter/Combiner Fault-tolerant ZCP270 module is connected to two pairs of fiber splitter/combiner. A pair of splitters/combiners connects redundant Ethernet ports in front of each module to redundant Ethernet switches in the control network.

Another pair of splitters/combiners connect redundant Ethernet fieldbus ports at the top of each module to redundant Ethernet switches in the control network. For each module, the splitter/combinator provides a separate transmit/receive fiber connection for each Ethernet control network and Ethernet fieldbus port. The connection of the fiber optic cable enables the splitter/consolidator to pass the inbound traffic of the switch to the two modules and the outbound traffic of the main module to the switch.

Each splitter/combiner pair is mounted in a component that is mounted in a case assembly for a 19-inch frame, or fastened to a DIN rail in the housing. A splitter/combiner is a passive device that does not require electricity. The Foxboro Evo architecture uses an Ethernet control network with 100Mbps data communication between the ZCP270s and the Ethernet switch (see Figure 2). The ZCP270 can also communicate with serial and Ethernet devices such as PLCS through field device system integrators and FCM100Ets/FCM100Es. This allows you to connect to a new device interface without changing the controller software. Online image Update For the fault-tolerant ZCP270 module, online image Update replaces the executable image (operating system) of the running ZCP270 with an updated image without having to shut down the device controlled by the ZCP270.

For heavy-duty controllers, new product enhancements can be live in 1.5 seconds; Less for light load controllers. Since the ZCP270 contains its executable images in internal flash memory and has enough RAM to hold new executable images at the same time, online image updates are now easier to perform. Time synchronization, SOE, TDRA Foxboro Evo systems support time synchronization using externally maintained Coordinated Time (UTC) optional sources or internal sources using proprietary software.

The ZCP270s and its FCM100Et, which receives time updates through an external time source, synchronize their FBM to 1ms. For more information, see PSS 21S-1C2 B3. Timestamps are used for alarm messages, values sent to history, and new event sequence (SOE) and transient Data Logger and Analyzer (TDRA) functions. SOE data are discrete points, time-stamped on the FBM, optionally 1ms, and sent to the workstation on a changed basis. The TDRA data is a time-stamped analog point on the FBM that is sent to the workstation every 10ms. The client software in the workstation supports these new features. To support SOE and TDRA, the FCM100Et is installed on the same network as the workstation where the data is collected. For information about the software, see PSS 21S-2B9 B4 and PSS 21S-2B10 B4. Software Features ZCP270 enforcement supervision,

Logic, timing and sequence control, as well as data acquisition, alarm detection and alarm notification. Process variables are controlled using time-validated algorithms (mathematical calculations that perform specific functions).

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