If_Conf: Sdt For The Configuration Data Of The Cp - Siemens CP 1243-7 LTE Operating Instructions Manual

5.4

IF_CONF: SDT for the configuration data of the CP

Structure of the system data type IF_CONF for the TC_CONFIG program block
The CONFIG parameter of the TC_CONFIG program block references the memory area
containing the configuration data of the CP to be modified. The configuration data stored in a
data block is described as a structure of the IF_CONF system data type (SDT).
To be able to use the (SDT IF_CONF there must already be configured values present in the
STEP 7 basic configuration of the CP.
IF_CONF is made up of a header followed by fields that correspond to the parameters or
parameter areas of the CP in the device properties of the STEP 7 project.
The CP configuration data to be modified is collected together as IF_CONF fields.
Parameters that will not be modified are ignored in the IF_CONF structure and remain as
they were configured in the STEP 7 project.
Creating the DB and the IF_CONF structures
You can create the parameters of the CP within the IF_CONF DB in one or more structures
each with one or more fields.
You will need to type in the data types of the fields using the keyboard. They are not
displayed in the selection list. The data types are not case-sensitive.
Follow the steps below to create IF_CONF:
1. Create a data block of the type "global DB" with block access "Standard".
2. Create a structure (data type "Struct") in the table of the parameter configuration of the
DB.
You can specify any name.
3. Under this structure add a header by assigning the name of the header and typing it in in
the cell of the data type "IF_CONF_Header".
The header of the structure and its three parameters (see below) is created.
4. Create a field for the first parameter to be changed by typing in the required data type (for
example "IF_CONF_APN") in the cell of the data type.
5. Repeat the last step for all parameters you want to change on the CP using the
TC_CONFIG instruction.
6. Finally, update the number of fields in the header in the "subfieldCnt" parameter.
Header of IF_CONF
Table 5- 1 IF_CONF_Header
Byte Parameter
0 ... 1 fieldType
2 ... 3 fieldId
4 ... 5 subfieldCnt
CP 1243-7 LTE
Operating Instructions, 04/2017, C79000-G8976-C381-03
Data type Initial value
UINT
UINT
UINT
5.4 IF_CONF: SDT for the configuration data of the CP
Description
Field type: Must always be 0.
Field ID: Must always be 0.
Total number of fields contained in the structure
Program blocks
113