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102 •
Programmable Field Bus Controller 750-833
Acyclic Communication According to DP/V1
The bus coupler supports the following acyclic services according to
IEC61158-3:
MSAC1 Service
MSAC1_Read
MSAC1_Write
MSAC2 Service
MSAC2_Initiate
MSAC2_Abort
MSAC2_Read
MSAC2_Write
The MSAC1 services are released when the DP/V1 operation has been
activated in the parameter data and the cyclic MSCY0 connection is
established. The MSAC1 connection is closed when the DP data exchange is
finished. In the event of cyclic or acyclic connection failures, both
communication channels will be closed.
The MSAC2_Initiate service is used to open an acyclic MSAC2 connection.
Once the connection has been established, it will be monitored by the C2
master. When failures occur, both the master and the slave can close the
connection via MSAC2_Abort. The bus coupler is able to manage a MSAC2
connection.
Requester
Responder
x
x
Requester
Responder
x
x
x
x
x
WAGO-I/O-SYSTEM 750
Bus System
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