Shared Var Input
Returns the signal from a shared variable
Category: Input
Description:
The Shared Variable blocks are used to communicate diagrams between tasks or inside a specific task. It is a kind of global variable with unrestricted scope, it can be accessed by any task and any diagram either finite state, transition, or signal flow. Additionally, it has a predictable behavior, since its value is always initialized as zero and is updated only at the end of a task execution with no interference by the scheduling logic during preemptions.
The Shared Variable Input block returns a value stored in a memory which is protected amongst processes of specific tasks. This memory is initialized as zero. When no value is set to a shared variable, it is expected that this block return zero.
The memory that contains shared variable values gets updated by a Shared Variable Output block at the end a task execution.
Parameters:
QFIRE CTR-101
has 128 different addresses in the memory to save data. These addresses work like global variables that can be accessed by different diagrams.
Shared Variable Input Dialog
Ports:
Input
Returns the value saved in the memory address selected in the Variable Index parameter field.
Data Types:
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