Engineering Documentation

Graphics engineering with Graphics Builder
Graphics Builder overview
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Siemens
A6V11211560_enUS_b
Building Technologies
2019-01-15
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Data points
Every data point in the system has a point or shadowPoint tag. Data points also have one of the
following tags to identify its type:
● cmd, which classifies a data point as an output, AO/BO, command, or actuator.
● sensor, which classifies a data point as an input, AI/BI, or sensor.
● sp, which classifies a data point as a setpoint, soft point or process control variable.
In this example, the Heating coil valve position has the (point or shadowPoint) and cmd tags.
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Information flow in the system
Information always flows from lower levels to higher levels of the building structure. Objects at
higher levels of the building structure do not send information to objects that are below them. For
example, information flows from a point (or shadowPoint) to an equip to a site to the Desigo Control
Point device at the Root .
In this example, a command is issued to the Heating coil valve position (point or shadowPoint). The
command flows upward in the building structure to the Heating coil (equip), then to the Automation
station view (equip) and finally to the Default site (site).
3.1.3 Data point binding
Point binding refers to the type of connection between a graphic component and an
object in the database of integrated data points. Two types of data point binding are
used in Graphics Builder:
● Absolute binding is a connection to a particular Object name or point ID in the
database.
– At runtime, a graphic component with absolute binding always fetches
information from the same data point in the database.
– A graphic with absolute binding can only be used for a specific group of
components in your system.
● Relative binding is a connection to a binding query that uniquely identifies a
specific point (or equip) in the database.
– At runtime, a graphic component with relative binding fetches data from a data
point based on its string of semantic tags and its relative position in the building
structure.
– A graphic with relative binding is an efficient reuse of existing graphics in new
projects because it can be used wherever you have the same structure of
components in a system.