Rockwell Automation Publication 20D-PM001D-EN-P - March 2019 157
Human Interface Module Overview Appendix A
Parameter Links
Most parameter values are entered directly by the user. However, certain
parameters can be “linked,” so the value of one parameter becomes the value of
another. For Example, the value of an analog input can be linked to [Accel Time
1]. Rather than entering an acceleration time directly (via HIM), the link allows
the value to change by varying the analog signal. This can provide additional
flexibility for advanced applications.
Each link has 2 components:
• Source parameter – sender of information.
• Destination parameter – receiver of information.
Most
parameters can be a source of data for a link, except parameter values that
contain an integer representing an ENUM (text choice). The are not allowed,
since the integer is not actual data (it represents a value). Refer to the list of
parameters in Chapter 2
Programming and Parameters for information on which
parameters can be destinations. All links must be established between equal data
types (parameter value formatted in floating point can only source data to a
destination parameter value that is also floating point).
Establishing A Link
Steps: Key(s): Example Displays:
1. Select a valid destination parameter to be linked. The
parameter value screen displays.
2. Press Enter to edit the parameter. The cursor will move to the
value line.
3. Press ALT and then View (Sel). Next, press the Up or Down
Arrow to change “Present Value” to “Define Link”. Press Enter.
4. Enter the Source Parameter Number and press Enter.
The linked parameter can now be viewed two different ways
by repeating steps 1…4 and selecting “Present Value” or
“Define Link.” If an attempt is made to edit the value of a
linked parameter, “Parameter is Linked!” will be displayed,
indicating that the value is coming from a source parameter
and cannot be edited.
5. To remove a link, repeat steps 1…5 and change the source
parameter number to zero (0).
6. Press Esc to return to the group list.
Min: 0.01000
Max: 6553.5
Dflt: 10.0
Present Value
FGP: Parameter
Accel Time 1
Decel Time 1
S Curve Time
Parameter: #32
Accel Time 1
Link:
800
Analog In1 Data
Define Link
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