![]() ![]() 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).To establish a connection to a S7 PLC there are 3 steps: 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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