4.2 Basic functions of Profibus DP
The master reads the input information from the slaves cyclically and writes
the output information cyclically to the slaves. In addition to this
cyclic data transfer of the process representation, Profibus DP also provides
powerful functions for diagnostics and commissioning purposes. The data
traffic is monitored through the monitoring functions on the master and slave
side.
4.3 Transfer mode
.
RS-485 twisted pair cable or fibre optical cable.
.
AUMA actuators support baud rates up to 1.5 MBit/s
4.4 Bus access
.
Token-passing between the masters and polling between master and
slave.
.
Mono-master or multi-master systems are possible.
.
Master and slave stations: max. 126 stations connected to one bus.
4.5 Communication
.
Peer-to-peer (net data transfer) or Multicast (control commands to all
slaves).
.
Cyclic master-slave net data transfer or acyclic master-master data
transfer.
4.6 Functionality
.
Cyclic net data transfer between DP master and DP slaves
.
Dynamic activation or de-activation of individual DP slaves.
.
Checking of the configuration of the DP slaves
.
Synchronisation of inputs and/or outputs.
4.7 Protection functions
.
All messages are transmitted with Hamming Distance HD=4.
.
Watch-dog timer at DP slaves.
.
Access protection for the inputs/outputs of the DP slaves
.
Net data transfer monitoring with configurable timer interval at the master.
.
Adjustable safety behaviour.
4.8 Device types
.
DP Master class 2 (DPM2), e.g. programming / configuration devices.
.
DP Master class 1 (DPM1), e.g. central controllers such as PLC, PC, ...
.
DP slave, e.g. AUMA Profibus DP devices. Devices with binary or
analogue inputs/outputs, actuators, valves.
Actuator controls AUMATIC AC 01.1 / ACExC 01.1
Profibus DP Operation instructions
6
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