Siemens S7-1200 Operating Instructions Manual page 100

Programming the program blocks
5.4 IF_CONF: SDT for the configuration data of the CP
Header of IF_CONF
Table 5- 1 IF_CONF_Header
Byte Parameter
0 ... 1 fieldType
2 ... 3 fieldId
4 ... 5 subfieldCnt
General parameters of the parameter fields
Each field has the following general parameters:
● Id
This parameter identifies the field and must not be modified.
● Length
This parameter indicates the length of the field. The value serves as information.
Fields with strings and / or arrays have a variable length. Due to hidden bytes, the actual
length of fields can be greater than the sum of the displayed parameters.
● Mode
The following values are permitted to these parameters:
Table 5- 2
Value
1
2
100
Data type Initial value
UINT
UINT
UINT
Values of "Mode"
Meaning
Permanent validity of the configuration data
Not relevant for the CP
Temporary validity of the configuration data, including deleting of existing permanent
configuration data
The permanent configuration data is replaced by the parameter fields of IF_CONF.
Description
Field type: Must always be 0.
Field ID: Must always be 0.
Total number of fields contained in the structure
Operating Instructions, 01/2015, C79000-G8976-C381-01
CP 1243-7 LTE