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Program Controller SE-707
© 2018 by STANGE Elektronik GmbH
Subject to technical modifications
79
With PROFIBUS-DP mono as well as multi master systems can be realized. By this way a high grade of flexibility for system
configuration is ensured. In case of mono master systems only one master is active at the bus when the bus system is in
operating status. Figure 2 shows the configuration of a mono master system. The PLC is the central control unit. The DP-
slaves are linked to the PLC as remote peripherals by means of the transfer media. This system configuration ensures the
shortest bus cycle time.
Figure 2: PROFIBUS-DP mono master system
In case of multi-master operation several master devices are connected by one bus. They are either sub systems
independently from one another, each consisting of one DPM1 and the corresponding DP slaves or additional projecting and
diagnosis devices (see figure 3). The input and output images of the DP slaves can be read by all DP masters; writing of the
outputs, however, is enabled only for one DP master (the DPM1 which had been defined during projecting). Multi-master
systems work with medium bus cycle times.
Figure 3: PROFIBUS-DP multi-master system
Содержание SE-707
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