Siemens SENTRON 7KN POWERCENTER 3000 Manual page 85

The data points are the measured variables of the Modbus device.
The attributes relevant for integrated services can be set with powerconfig.
Description of a data point
Attributes of a data Description
point
Language-specific In the 7KN Powercenter 3000, data points are handled in various lan-
name guages, e.g. in the web user interface. These names can be defined for the
individual languages here.
Uniform name This attribute is optional. It is used by 7KN Powercenter 3000 for uniform
handling of such data points across all device types.
These are currently the SENTRON powermind and the project Export (json,
csv).
A data point can be assigned to one of these selectable uniform names.
Category Assignment of the data point to one of the defined categories
Register address Register address [0001, 65535] of the data point must be entered in the
Modbus device. The register address 0 is used as the default value. I.e. this
address is not actively used.
Register count Number [1.125] of register addresses occupied by the data point.
Byte offset Byte position within the addressed register from which the data are inter-
preted.
Byte count Number of bytes that are interpreted.
Bit offset Bit position within the addressed register from which the data are inter-
preted.
Bit count Number of bits that are interpreted.
Data format The format for the data point must be chosen here. For details, see the
table Supported data formats below.
Scaling factor This factor must be applied to the value.
E. g. at frequency 0.01: Value 5015 x 0.01 = 50.15 Hz
Display format In this way, display of the value on a user interface, e.g. the web user inter-
face of the 7KN Powercenter 3000 can be controlled.
•
•
•
•
•
Unit Basic unit of the value, such as A, V, W
Runtime settings The setting(s) control processing of the value by 7KN Powercenter 3000
Archiving On → Values are archived every 10 seconds and 15 minutes.
Off → No archiving
In particular in existing Modbus devices, several data points, e.g. individual statuses, are
shown partly in a Modbus register. With these attributes, several data points can be read out
of the same register.
Individual data points on a Modbus address are addressed according to the following system.
7KN POWERCENTER 3000
Equipment Manual, 07/2020, L1V30579222003-03
Scaling: Values with the most significant 4 decimal places.
Counter value: The value is displayed with all its digits.
K count value: The value is displayed with all its digits and k (= Kilo).
Boolean: 0 → "No", 1 → "Yes"
Text: Value is displayed as text.
Functions
5.9 Modbus devices
Notes
= Uniform Name
See Example for ad-
dressing a data point
(Page 84)
See the table Support-
ed data formats below
(Page 85)
Depending on the time
zone chosen, a suitable
decimal separator e.g.
"." in the USA or "," in
Europe is used.
For numeric data
points only
83