Download Engineering Manual SPSPlusWIN - Prerelease

Engineering of functions
Engineering Manual SPSPlusWIN
Convert LINEAR1
Description
This function supports the linear conversion of variable values for the
scaling of the control values.
This function calculates the values by this equation: Y = X * P1 + P2;
The following terminology is used:
Electrical value:
The electrical value is the value
stored in the control.
Physical value
The physical value is the value
displayed on the user device.
The function is engineered on an analog variable.
The physical value is converted to an electrical value during initialisation
or when a setpoint value is entered.
The electrical value is converted to a physical value when the actual value
changes.
The function CONVERT LINEAR1 is the reverse function of the
CONVERT LINEAR2 function.
Validity
for performance class VISUALISATION only
Engineering
» Engineer an input field or output field with an analog
variable on a screen page.
» Go to the FUNCTIONS page in the ANALOG
VARIABLE dialog.
» Select the CONVERT LINEAR1 function and enter
the parameters.
» Select one or several of the following conditions.
• ON VARIABLE INIT
• ON ENTER
• ON VALUE OUTPUT
Parameters
• Constant for parameter P1
• Constant for parameter P2.
Page 232
 SAE-STAHL GMBH / ENGINEER.DOC / 20.06.2000