Siemens SIPART PS2 Operating Instructions Manual page 221

Figure 10-5
In this example, all data in the input and output directions supported by the device are
transferred. The selected peripheral starting address is 256 (W#16#100).
Note
Only the older SIMATIC CPUs require the SFC14 and SFC16 modules for consistent reading
and writing.
Byte
Byte 15
Byte 10
SIPART PS2 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB
STEP 7 sample program
Legend of the sample program
Function
Input data
Output data
Functions/operations using PROFIBUS PA
10.3 Cyclic data transfer
Composition
READBACK
RCAS_OUT
CHECKBACK
POS_D
SP
RCAS_IN
Number of bytes
5
5
3
2
5
5
221