Boolean Logic / Calculations - Danfoss AK-SM 850 User Manual

Boolean Logic / Calculations

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
confirm 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 configured
calculated point will be listed. The fields are as follows:
Example of Calculations Tab
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 definitions area This area contains information that
identifies 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 definitions, 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 first example.
AK-SM 850 User Guide USCO.PI.R1.E1.02 © Danfoss 07-2013
Lit. no.
New Calc
When first entering the calculations screen a line called New Calc
is shown. To configure a new point, double click this field.
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 off for OI
points, and a value for SI points.
Status
(Online, Offline, Error)
Double click to add new calculation
Rules area This is the area that will contain the logical statements
that determine whether the point is on or off (OI) or the value (SI)
that is used. At the bottom of the area is the current value of the
result.
Heading
Data Definitions
Rules Area
'Else' line
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