Det-Tronics S3 Graphics - Manual (Page 264)

EQP LOGIC EDITOR 13-39 EQP LOGIC EDITOR
Version 6.0
Input Variable
All input variables to a program or function are via this symbol. Once placed on a logic sheet, the
input variable must be “linked” to a compatible parameter on the controller, a field device, or a
location in controller memory.
Output Variable
All output variables from a program or function are via this symbol. Once placed on a logic sheet,
the output variable must be “linked” to a compatible parameter on the controller, a field device, or a
location in controller memory.
Local Variable
Local variables are available in function blocks only. If a sheet for a standard “Program element” is
opened, this function will be grayed out. These variables provide for the transfer of values between
sheets of a multi-sheet block and private local storage (local variables).
Constant Value
Constants allow for user set values to be input to a function or output variable that do not change
during the execution of the program or function.
Comment
The user may want to place comments on the sheets to communicate what task a section of logic
performs or any other annotation.
In the example above, there is a comment indicating “Pre-Alarm timer allows visible and audible alarms to signal
prior to discharge of FM-200” below the timer that delays discharge while annunciation is in progress.
Connection Tool
The function block inputs and outputs are connected via the “Connection Tool”. This tool is also
referred to as the “Line Tool” and the “Wire Tool”.
Errors/Warnings
When a build is performed any and all errors are reported via a window. This icon opens the “Error/
Warning Viewer” described earlier in this section.
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