Configurations for Increased Availability and Safety-PM665 3BDS005799R1

　　Configurations for Increased Availability and Safety

　　Advant Controller 160 offers a wide range of configuration options for control system applications with high requirements concerning availability and safety.

　　For high availability—depending on the requirements—a single or even a double fault must be tolerated by the control system. I.e. the configured functions e.g., the control functions of a turbine must run without any interruption in case of a fault.

　　For safety a single or even a double fault must not impede a needed trip of the plant (e.g. a boiler or a turbine). Additionally for high availability usually it is required that a single fault must not activate a trip.

　　Availability can be increased through redundancy. Advant Controller 160 offers module redundancy for all central system components (communication modules, Processor Modules, power supply modules). For redundant signal I/O multiple I/O modules within separate controllers can be used.

　　Safety can be increased through the use of multiple safety channels working in parallel.

　　In the following paragraphs the redundant and parallel configurations supported by Advant Controller 160 and its Processor Modules are shown.

　　For more detailed information refer to the Advant Controller 160 Users Guide.

　　Configuration for Redundant Processing

　　The Processor Modules PM645B, PM646, and PM665 can be used for redundant processing:

　　Two Processor Modules within one station and with common I/O modules, synchronization via high speed serial link (Figure 4-4).

　　Advant® Controller 160 Product Guide Chapter 4 Advant Controller 160 Configurations

　　For CPU redundancy Processor Modules PM645, PM646, or PM665 with Communication Interfaces CI630/CI631 must be used in order to avoid single point of failure, even if no Advant Fieldbus 100 communication is required.

　　Configuration for Parallel Processing with External Voting

　　All Processor Modules can be used for parallel processing with external voting if the Processor Modules are allocated within one common station:

　　Dual parallel Processor Module

　　Two Processor Modules within one station with separate output modules and common set of input modules (Figure 4-5).

　　Triple parallel Processor Module

　　Three Processor Modules within one station with separate output modules and common set of input modules (configuration not shown, similar to dual parallel Processor Module).

　　The Processor Modules PM645C or PM646 can be used for parallel processing with external voting if the Processor Modules are allocated within separate stations:

　　Dual parallel station

　　Two Processor Modules within separate stations each with its own set of I/O modules, sensor signal exchange via high speed serial link (configuration not shown, similar to triple parallel station)

　　Triple parallel station

　　Three Processor Modules within separate stations each with its own set of I/O modules, sensor signal exchange via high speed serial link (Figure 4-6)

　　Dependent on the specific configuration additional HW modules and cables for parallel processing are needed:

　　The parallel Processor Modules within different stations must be connected with one another via its high speed serial link interfaces. Therefore one connection cable set TK661 is to be used per connection.

　　For configurations with parallel Processor Modules the output signals to be provided via two respectively three separate output modules must be voted externally. Therefore specific voter devices must be used.

　　For Turbine Protection of ABB Turbines, three solenoid valves with electro hydraulic 2oo3 voting is the standard solution.

　　System Clock Synchronization

　　Methods and System Components

　　Dependent on the specific system configuration using Advant Controller 160 different methods are available for synchronization of the system time:

　　Time and date can be set via AS 100ES, AdvaSoft for Windows and can be downloaded to Advant Controller 160 at the same Advant Fieldbus 100. Advant Controller 450 can be loaded from AS 100ES via front connector.

　　Clock synchronization via Advant Fieldbus 100 can be done by a controller which is configured as time master through sending the actual time as broadcast message once a second via Advant Fieldbus 100. Any Advant Controller 4501 or Advant Controller 160 but only one can be configured as time master. The other controllers and the stations are time slaves, receive the time sent and update its internal clocks.

　　External clock synchronization with use of a minute pulse input is supported for Advant.

　　Controller 160 (with Processor Module PM645, PM646, PM665 via I/O port) and for Advant Controller 450. The minute pulse must be provided by a central clock, for example as output of a radio clock.

　　External time signal using a DCF77 clock connected to the Com B serial line connector of the Processor Modules of Advant Controller 160.

　　In case of missing synchronization the internal clocks of the controllers and stations provide the actual time with reduced accuracy.

　　Table 4-7 gives an overview on the controllers usable as time master for synchronization via Advant Fieldbus 100 with its used methods and needed system components for system time input and synchronization.

　　Advant Controller 450:Manual setting of time and date via AS 100ES1 directly connected to Advant Controller 450 and external synchronization via minute pulse input of TC520.

　　Advant Controller 160:Manual setting of time and date via AS 100ES, AdvaSoft 2.0 for Windows NT and external synchronization via minute pulse input to PM645, PM646, PM665, or external synchronization via DCF77 time signal to all Processor Modules.

　　Configurations

　　Two typical configurations as normally used for control systems are:

　　Autonomous control system with Advant Controller 160 and Operator Station AdvaSoft 2.0 for Windows NT.

　　Control system with several Advant Controller 160 and superordinate Advant Controller 450 and Operator Stations Advant Station 500OS.

PM665 3BDS005799R1.pdf

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