User Manual

Rockwell Automation Publication 20B-UM002G-EN-P - July 2014 107
HIM Overview Appendix B
Linking Parameters
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
2]. 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). These are not allowed,
since the integer is not actual data (it represents a value). Ta b le 15
lists the
parameters that 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). A maximum of ten links is
allowed.
Establishing A Link
Step Example Displays
1. Select a valid destination parameter (see Tab le 15
) to be linked
(refer to page 106
). The parameter value screen will appear.
2. Press the (Enter) key to edit the parameter. The cursor will
move to the value line.
3. Press the key and then the key. Next, press the or
key to change “Present Value” to “Define Link.” Then press the
(Enter) key.
4. Enter the Source Parameter Number and press the (Enter) key.
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 the key to return to the group list.
ALT
Sel
Esc
Min: 0.1 Secs
Max: 3600.0 Secs
Dflt: 10.0 Secs
Present Value
FGP: Parameter
Accel Time 1
Accel Time 2
Decel Time 1
Parameter: #141
Accel Time 2
Link:
017
Analog In1 Value
Define Link
…