Siemens SIMATIC ET 200AL, System Manual

Page: 1984 / 2255

Functions
5.5 Intelligent DP slaves (I-slaves)
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
87
Programming the I-slave
To program the sample program for the I-slave, follow these steps:
1.
Using the SCL programming language, create a new function with the name
"preprocessing" in the project tree under "Program blocks" > "Add new block". Open the
function.
2. In the interface of the function "preprocessing", create the following tags:
Name Data type Input/output type
input 1 bool Input
input 2 bool Input
result bool Output
3. In the instruction window of the function "preprocessing", write the following program
code:
#result:=#input 1&#input 2;
4. Call the function "preprocessing" in a cycle OB, for example, in OB1.
5. Wire the function "preprocessing" in the cycle OB as follows:
Figure 5-18 I-slave sample program