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Circuit Breakers
Circuit Breakers allow you to control a NOL diagram with a loop. They are not
required if another block can halt the iteration of the loop. Otherwise, you use the
circuit breaker to prevent infinite loops in a diagram.
When the Circuit Breaker is open, the value on the path is propagated across the
breaker unchanged, but NOL does not evaluate the downstream block immediately. The next block evaluates when it receives data from somewhere else. When
the Circuit Breaker is closed, the value on the path is propagated across the
breaker, and the downstream block evaluates immediately.
Circuit Breakers contain a menu choice for opening and closing the circuit
breaker. If the circuit breaker is open, the menu choice is close breaker, and if the
circuit breaker is closed, the menu choice is open breaker.
Opening and closing the circuit breaker also changes the icon as shown in the
following figure:
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All types of circuit breakers are open by default.
Configuring
Circuit Breaker configuration panels vary depending on the type of circuit
breaker.
Configuring the Data Path Circuit Breaker
This is the configuration panel for the Data Path Circuit Breaker.
Configuring the Inference Path Circuit Breaker
This is the configuration panel for the Inference Path Circuit Breaker.
Configuring the Control Path, Vector Path, and Data Pair Path Circuit
Breakers
The Control Path Circuit Breaker, Vector Path Circuit Breaker, and Data Pair Path
Circuit Breaker have no configurable attributes.
Example
In the following example, the Circuit Breaker is open, which allows the
Summation block to accumulate values from the Numeric Entry Point each time a
new value appears on the path. Do not close the Circuit Breaker in this situation.
See Also
For more information on how to use this block, see the sections below.
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Copyright © 1996, Gensym Corporation, Inc.
