Danfoss AK-SM 850 - Boolean Logic; Calculations

Double click to add new calculation
Example of Calculations Tab
Calculations
Miscellaneous calculations are used to create custom logic. The
AK-SM has the capacity for a total of 96 calculations which can
be used to ‘drive’ miscellaneous logic where special applications
are required. There are several ways to formulate calculations for
a given requirement, but testing as you go is a ‘must’ in order to
conrm desired results. A calculated point created here can be
used anywhere a board & point address can be referenced. The
calculated points processor is a true boolean processor, with a full
complement of argument types and operators. Every congured
calculated point will be listed. The elds are as follows:
Boolean Logic / Calculations
After adding a new calculation, a default screen will be shown
(similar to the example below). The screen is divided into three
areas, which from top to bottom are the following:
Heading area The heading of the screen tells what type and style
of calculation point will be created.
Data denitions area This area contains information that
identies points that will be used in the logical statements in the
next area, and the current value of each. The area by default has
lines for two denitions, but it can be enlarged by double clicking
the ***Press to insert new line ****. You will see this done in a few
pages during the presentation of our rst example.
Heading
Data Denitions
Rules Area
‘Else’ line
New Calc
When rst entering the calculations screen a line called New Calc
is shown. To congure a new point, double click this eld.
Description
The type of point (OI or SI). If an SI, the description will usually
include the units.
Point
(Ca-01 to Ca-96) The name of the calculated point.
Value
The current value or state of the point. This will be on or o for OI
points, and a value for SI points.
Status
(Online, Oine, Error)
Rules area This is the area that will contain the logical statements
that determine whether the point is on or o (OI) or the value (SI)
that is used. At the bottom of the area is the current value of the
result.
AK-SM 850 User Guide Lit. no. USCO.PI.R1.E1.02 © Danfoss 07-2013 55