Configuration for Parallel Processing with External Voting-ABB PM645A/B PM645A/B
Date: May 07, 2025Views:
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
1. Advant Controller 450 can only be used as time master on Advant Fieldbus 100. PM645C PM645C PM645C 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.
Autonomous Control System with Advant Controller 160 and AdvaSoft
The configuration is shown in Figure 4-7.
The Operator Station AdvaSoft 2.0 for Windows NT is time source, Advant Controller 160 on left is time master and can be synchronized via an external minute pulse. The other controllers are time slaves. The time master can contain a single Processor Module or dual or triple redundant Processor Modules or up to six Processor Modules for multiprocessing.
In case of redundant Processor Modules, the minute pulse is connected to each Processor Module. The active Processor Module is always the time master.
In case of single Processor Modules or station redundancy, the minute pulse is connected only to one Processor Module in one controller, which is the time master.
The time master sends time and date cyclically once a second as broadcast message. All other controllers receive these messages and set its internal clocks. Between two consecutive minute pulses the time master’s internal clock runs independently ever providing the actual time.
Control System with Superordinate Advant Controller 450
The configuration is shown in Figure 4-8.
The controller Advant Controller 450 is time master. It can be synchronized via MB300 or via an external minute pulse. The other controllers at the Advant Fieldbus 100 are time slaves.
Advant Controller 450 cyclically sends time and date once per second as broadcast message via Advant Fieldbus 100.
The other controllers receive these messages and set its internal clocks.
Between two consecutive minute pulses the time master’s internal clock runs independently ever providing the actual time.
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