Detected Siemens SIMATIC S7 series PLCs by completing the ISO-on-TCP (COTP) handshake and issuing an S7comm SZL (System Status List) read for the module identification list (SZL-ID 0x0011) over port 102. Genuine S7-300/400/1200/1500 CPUs answer with their MLFB / order number, which always begins with the "6ES7" prefix. The SIMATIC S7 family is part of Siemens' industrial automation product line widely used in Industrial Control Systems (ICS).
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