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One S7comm function code byte divides a PLC read from a memory write
A hand-built client walked TPKT, COTP and S7comm against a Snap7 server on port 102, negotiated a 480-byte PDU and pulled 16 bytes out of DB3 with function code 0x04. The layers below that byte are the same for a write.
Publishers:dev.to
Reality
- Evidence60
- Adoption
- Insufficient
- Hype gap−5
- Incentives42
- Confidence52