The Siemens S7-200 driver exchanges data between OPC clients and Siemens S7-200 PLCs using the PPI (11 bit) or PPM (10 bit) protocol. It includes direct support for the EM241 Modem Module. Kepware automatically optimizes data acquisition based on client demand and ensures data integrity through extensive error handling.
The driver normally operates using the standard 11 bit PPI protocol. If the use of the EM 241 modem module is required, the S7-200 PPM model must be selected. The S7-200 PPM model allows the driver to operate in a 10 bit mode, which is more compatible with a wide range of off-the-shelf modems. The 10 bit PPM mode can also be used directly on the PLC's programming port. To enable the 10 bit PPM mode, set the S7-200 programming cable 10 bit mode.