Siemens SIMATIC ET 200AL, System Manual

Page: 1700 / 2255

Functions
5.2 Intelligent IO devices (I-devices)
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
135
4. Call the function "preprocessing" in a program cycle OB, for example, in OB1.
5. Wire the function "preprocessing" in the program cycle OB as follows:
Figure 5-15 I-device sample program
Programming IO controller
To program the sample program for the IO controller, follow these steps:
1.
Using the SCL programming language, create a new function with the name "further
processing" in the project tree in "Program blocks" > "Add new block". Open the function.
2. In the interface of the function "further processing", create the following tags:
Name Data type Input / output type
result bool Input
output bool Output
3. In the instruction window of the function "further processing", write the following program
code:
#output:=#result;
4. Call the function "further processing" in a program cycle OB, for example, in OB1.
5. Wire the function "further processing" in the program cycle OB as follows:
Figure 5-16 IO controller sample program
Result
The IO controller and the I-device can exchange data with each other through the
input/output transfer areas.