S5-95U, Second Serial Interface Computer Link with 3964(R) Transmission Protocol
Protocol errors
The transmission protocol recognizes errors caused by the communication partner and errors
caused by line faults.
In both cases, the send or receive procedure is repeated. If the data block cannot be sent or
received even after the maximum number of repetitions (or if another error occurs), the transmission
protocol stops sending or receiving. A specific error number is entered in the coordination byte and
the PLC enters the idle state.
EWA 4NEB 812 6095-02
3-25
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