Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 139)

Configuration
8-19
Loop (Program) Configuration
A configuration consists of one or more loops (programs). A loop is a group of Function Blocks that
are executed sequentially (from the left to the right and from the top to bottom). The minimum PID
loop configuration is shown in the Function Block diagram below.
The allowable argument names and values depend on the function. The Properties of the function may be
shown as part of the function block or may be hidden by re-sizing the block. Right-click on the function
and select the “Properties” option to show details of the function properties (see below). Double-clicking
in the gray area of the function block will also bring up the properties window for that function block.
The Analog Input function (shown above) processes the field analog signal and converts it to
engineering units. The output of each function is called the “Main Signal Value” (MSV)
Program Organization Units
An application is a list of programs. Programs are executed sequentially within the target cycle,
according to the following model:
FIGURE 8-7
Loop Configuration
(above) and
Function Properties