MTS Series 793 - Manual (Page 353)

Warning:
Expressions use SI (Systeme International d’Unites) units, such as millimeters and Newtons.
The Station Manager application can be calibrated and programmed using U.S. Customary units,
such as inches and pounds. Applying the results of an SI based expression in a control loop
using U.S. Customary Units can produce violent actuator movement.
Violent actuator movement can result in injury and equipment damage.
Use care when applying the results of an expression.
Calculation Definition Panels
Description Item
Create and edit formulas here for Calculated Analog Inputs, Calculated
Analog Outputs, Calculated Digital Inputs, and Calculated Digital
Outputs selected in the navigation pane. Expression
Create and edit expressions using the Expression toolbar and
Arithmetic Operator buttons, as well as by direct typing.
Displays the results of clicking Apply to compile the formula. Results
Success indicates a successful compilation.
Error messages identify errors by row and column, which may not
always be accurate. Undefined variable errors produce messages that
point to the end of the formula.
Use to insert common Operators, Functions, and Signals into the
Expression box’s formula. Insert
Use this toolbar’s buttons to insert common operators into the
Expression box’s formula. Arithmetic Operators toolbar
Select and then double-click to insert these common functions into
the Expression box’s formula. Functions
Displays a tree view of signals that can be used in formulas. Signals
Signals designated as “reconfigurable” are removed from this list of
available signals.
Double-click to insert signals into the Expression box’s formula.
The following signal types are available:
Real Signals—These are actual station signals, such as Command.
Integer Signals—These signals use an integer representation, such
as Count.
Calculation Parameters—Parameters defined using the Calculation
Editor window’s Parameter Definition panel.
Compiles and saves the formula. Apply
The Results box shows the success or failure of a compilation.
MTS Series 793 Control Software 353
Calculated Signals