PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
127
Startup
7
7.1 Operating Modes of the CP 340
Introduction
The CP 340 has the operating modes STOP, new parameterization and RUN.
STOP
When the CP 340 is in STOP mode, no protocol driver is active and all send and receive
jobs from the CPU are given a negative acknowledgment.
The CP 340 remains in STOP mode until the cause of the stop is removed (e.g., break,
invalid parameter).
Assignment of new parameters
For new parameterization, the protocol driver is initialized. The SF LED is on during new
parameterization.
Sending and receiving are not possible, and send and receive frames stored in the CP 340
are lost when the driver is subjected to a warm restart. Communication between the CP and
the CPU is restarted (active frames are cancelled.)
At the end of the new parameterization, the CP 340 is in RUN mode and is ready to send
and receive.
RUN
The CP 340 executes the CPU jobs. The frames received by the communication partner will
be prepared for their transfer to the CPU.
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