Configuration
4.18 Data points
CP 1243-8 IRC
144
Operating Instructions, 02/2018, C79000-G8976-C385-03
4.18.6
Configuration of the data point index
Configuration of the data point index
Below you will find the rules for configuring the data point index for the various protocols.
ST7
The data point indexes must be unique in a module.
Data point indexes assigned twice are indicated as errors in the consistency check and
prevent the project being compiled.
DNP3
On a module, data point indexes must be unique within each of the following object groups:
●
Binary Input / Binary Input Event
●
Binary Output / Binary Command
●
Counter / Counter Event
●
Analog Input / Analog Input Event
●
Analog Output
●
Octet String / Octet String Event
Indexes of two data points in different object groups can be identical.
IEC
The data point indexes must be unique in a module.
Data point indexes assigned twice are indicated as errors in the consistency check and
prevent the project being compiled.
4.18.7
Process image, type of transmission, event classes
Saving the data point values
The values of data points are generally stored in the image memory of the CP.
Events are also stored in the send buffer and can be transferred unsolicited.
Data points are configured as a static value or as an event using the "Type of transmission"
parameter (see below).
