Figure 3: Structure for DP-V2 redundancy according to guideline 2.212
The master generally uses parameter telegrams to determine which Profibus DP
communication channel is the primary channel and which is the backup channel.
The primary channel is used to operate the actuator, the backup channel can also
be used to establish a Profibus DP connection as an option; operation commands
of the backup channel will, however, be ignored by the actuator.
Feedback signals on the communication status of the two Profibus DP interfaces
and on received requests for changing the channels are performed by the extended
diagnostic (Red_Status, 3 bytes); not all DCS support this extended diagnostic
telegram.
Controls (DPM1 = master of class 1) can only write and read acyclic DP-V1 data via
the primary channel. Engineering stations (DPM2 = master of class 2) can use both
channels to read and write acyclic DP-V1 data (writing the same parameter via both
communication channels simultaneously is, however, not possible).
Details for change-over and behaviour are stipulated in PNO guideline 2.212.
If neither of the channels exchange process data with the controls or if both channels
receive Fail Safe telegrams (telegrams with the data length = 0) or Global Control
Clear (GC Clear) telegrams, the set failure behaviour or EMERGENCY behaviour
is started.
The redundant behaviour according to Profibus DP-V2 redundancy requires activation
of the Profibus DP-V2 functions.
4.5.
Profibus DP-V2 functions
— Option —
In addition to the cyclic Profibus DP-V0 process data exchange and in addition to
the acyclic Profibus DP-V1 data exchange, the Profibus DP-V2 functions define
further, more comprehensive functions:
●
Isochronous mode
●
Cross traffic between slaves
●
Upload and download
●
Redundancy
●
Time synchronisation with time stamp
The actuator controls AUMATIC AC 01.2 supports the following functions:
●
Redundancy
●
Time synchronisation with time stamp
This means the two functions are only available combined. If only the time
synchronisation with time stamp is exclusively required, the redundant channel can
remain unconnected (connection with Profibus DP master not imperatively required.)
Profibus DP-V2 functions can be activated using the following parameter:
Device
configuration
>
Application functions
>
Activation
>
Profibus DP-V2 M0587
45
Actuator controls
AC(V) 01.2/AC(V)ExC 01.2 Profibus DP
Description of the data interface
Содержание AC(V) 01.2
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