![]() ![]() The first byte of the destination TSAP codes the communication type (1=PG, 2=OP). Step 2) uses as a destination TSAP of two bytes length. Step 1) uses the IP address of the PLC/CP. Connect on S7comm layer ( = 0xf0, Setup communication) Connect on ISO layer (COTP Connect Request)ģ. To establish a connection to a S7 PLC there are 3 steps:Ģ. Special communication processors for the S7-400 series (CP 443) may use this protocol without the TCP/IP layers. The first byte is always 0x32 as protocol identifier. ![]() The S7comm data comes as payload of COTP data packets. It is used for PLC programming, exchanging data between PLCs, accessing PLC data from SCADA (supervisory control and data acquisition) systems and diagnostic purposes. S7comm (S7 Communication) is a Siemens proprietary protocol that runs between programmable logic controllers (PLCs) of the Siemens S7-300/400 family. ![]()
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