L-INX/L-GATE User Manual
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LOYTEC
LOYTEC electronics GmbH
Manual [1]. For a comprehensive description of the data point configuration on the device
please refer to the LINX Configurator User Manual [2].
Figure 48: Data points on the Web interface.
7.3 IEC61131 Variables
IEC61131 variables are used to exchange data with the IEC61131 program. These variables
are represented in the data point configuration as register data points and can be connected
to other data points, e.g. to CEA-709 NV points, via data point connections.
In contrast to CEA-709 or BACnet variables, IEC61131 variables are always represented as
single data point. In case of scalar values (representing CEA-709 scalar or enumeration types)
one of the following basic data types might be used:
Double
: A register of base type
double
is represented by an
analog
data point. It can
hold any scalar value. No specific scaling factors apply.
Signed Integer
: A register of base type
signed integer
is represented by a
multi-state
data point. This register can hold a set of discrete states, each identified by a signed stats
ID.
Boolean
: A register of base type
boolean
is represented by a
binary
data point. This
register can hold a Boolean value.
Structured IEC61131 variables, representing for example structured NVs, or customer
defined IEC61131 structures, are stored as user type:
User
: A
user
data point contains un-interpreted, user-defined data. The data is stored as
a byte array. A user data point does not include any other meta-data. This type of data
point also serves as a container for otherwise structured data points and represents the
entire data structure. User data points can only be connected to other user data points of
the same data length.