Logic Symbols; Symbol Properties; Inputs; Outputs - Crestron SIMPL Windows User Manual

Software
Example: Analog Ramp symbol
16 • Crestron SIMPL Windows
symbols to be connected, but not added or deleted. Device symbols are located in the
Device Library of the Configuration Manager.

Logic Symbols

While device symbols allow you to communicate with the outside world, logic
symbols allow you to make your program perform exactly the way you want. Logic
symbols can range from the very basic ones such as the AND, OR, or NOT symbols,
to those designed for very special applications. A more in-depth discussion of logic
symbols can be found in the Programming with Symbols section.

Symbol Properties

Although each symbol serves a special purpose, all symbols share some basic
properties. These are inputs, outputs, and parameters.

Inputs

Symbol inputs allow signals to be connected from other parts of the program.
Depending upon the symbol type, the current state of the input signal(s) may affect
one or more output signal(s). Some symbols have a fixed number of inputs, while
others can have a variable number of inputs, determined by the programmer based
upon need.

Outputs

Except for a few special cases, the ultimate purpose of a symbol is to modify the
states of its outputs. These outputs states will depend upon the symbol type, the
current or past states of the input signals, and the values of the parameters. Because
the symbol alone determines the states of its output signal(s), the symbol is
considered the driving source for the output signals. Depending on the nature of
signal, some outputs can have more than one driving source.
Similar to symbol inputs, the number of symbol outputs is fixed for some symbols,
or can be variable based on need for other symbols.

Parameters

Some symbols also have parameters, which are constant values that help determine
how the symbol behaves. For example, a symbol that delays an action for a specified
period of time would have a parameter determining how long the delay should be
for. The exact function of a parameter depends solely on the symbol type itself.
Crestron SIMPL Windows
Primer – DOC. 6253