Honeywell EXCEL 5000 User Manual page 125

EXCEL CARE CONTROL ICONS ALPHABETIC REFERENCE
Other Examples See the Examples chapter in this manual for examples of MAT control icon use with
other control icons.
Control Strategy MAT
I/O Dialog Box
Input None. The mathematical editor dialog box controls formula inputs.
Output One analog output (Y). You assign a user address to this output point. It is the result
of the formula and names the formula.
You cannot directly connect the output with a user address. To connect the output to
the software bar (that is, to output to a pseudopoint), use an IDT operator.
Formula Names Formula names apply only to the plant where they are defined. They cannot be
duplicated within the controller. When you try to attach the plant, software displays
an error message that the name is already used and gives you the option of
changing the name. These names do not appear in the controller summary. If you
are using several MAT functions in a plant, it is useful to assign Y1, Y2, Y3, etc, so
they are easy to remember. The names are case-sensitive (that is, y1 is not the
same as Y1).
Analog Rule You can only use analog points in a formula. See the Digital Conversion note later in
this section for a technique to convert digital point information to analog for use in
formulas.
Formula Example The following formula calculates the value of a user address called Y by multiplying
the value of User_address_20 by 4 and then dividing the result by the value of
User_address_15:
Y = 4 * User_address_20 / User_address_15
Formulas can include analog physical points and pseudopoints. Formulas cannot
include digital points. See the Digital Conversion note later in this section for a
technique to convert digital point information to analog for use in formulas.
The name of the formula in this example is Y.
127 74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)