Technical data

8.4.1.1 Program for PLC 1
During the PLC start up, the CP interface is synchronized with the
SYNCHRON handling block.
Four data words will be sent from PLC 1 to PLC 2. At the same time, four
data words will be requested from PLC 2 (SRD). PLC 2 transfers the
requested data to a buffer using an RPL_UPD_S job.
The data (request) are transmitted with the SEND HDB, the receive data
and "acknowledgments" (confirmations/indication) are received with the
RECEIVE HDB.
To be able to monitor the data exchange, you must evaluate the status
word for this job continuously. The status word contains information about
the status of the job, information about data management and error codes.
8.4.1.2 Program for PLC 2
PLC 2 receives 4 data words. At the same time, 4 data words are
requested by PLC 1 and are transmitted or transferred to the buffer
(RPL_UPD_S).
B8976060/02 Free Layer 2 Communication
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