The ibaPDA-Request-S7-UDP interface is suitable for the measurement data acquisition with free variable selection over standard network cards via UDP. The measurement data is sent actively from the controller to ibaPDA. For this purpose, several Request blocks have to be integrated in the S7 program for each connection. These Request blocks are used to cyclically send the current values of the S7 operands selected by the user within ibaPDA to be recorded in ibaPDA. When modifying the signal selection, no modification in the S7 program is required.

You can select the signals to be measured either with the absolute operand address or with the symbolic name with support of the ibaPDA address book browser. This browser allows to access to all defined symbols of the attached STEP 7 project.

You can use optimized data blocks for S7-1500 controllers. Signals within these data blocks can only be addressed via their symbolic name and not via the address or operand. For CPUs with firmware V3 or higher, it is also possible to access this data with special request blocks.

On side of the SIMATIC S7, you can use a PROFINET interface integrated on the CPU as well as an additional Ethernet capable communication processor (e.g. CP343-1, CPU343-1 LEAN, CP443-1, …). The data volume that can be reached depends besides of many other factors significantly on the selected interface. Generally, interfaces integrated on the CPU are more powerful than communication processors, since the connection via the backplane bus represents a performance shortage. Especially for the modules of the S7-300 family, there are considerable shortages. For detailed information, please refer to the Siemens device and system manuals.