Startup
7.3 Behavior of the CP 340 on Operating Mode Transitions of the CPU
PtP coupling and configuration of CP 340
130 Manual, 04/2011, A5E00369892-03
Points to Note when Receiving Message Frames
With the CP 340: Point–to–Point Communication, Parameter Assignment tool can be used to
configure the “Delete CP receive buffer at startup = yes/no.”
● If you select "yes", the receive buffer on the CP 340 is automatically deleted when the
CPU mode changes from STOP to RUN.
● If you select "no", as many message frames as you have parameterized are stored in the
CP 340 receive buffer (1 to 250).
If the CPU changes to STOP mode during transmission CP < CPU, the P_RCV FB reports
the error "current program interrupted, request aborted due to BREAK/restart/ reset" after
restart. If "Delete CP receive buffer at startup = no" is set, the message frame is
retransmitted from the CP 340 to the CPU.
See also
Serial Transmission of a Character (Page 23)
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