12.2010 Communication / SIMOLINK
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.3-25
8.3.12 Master/slave functionality
In the master-slave functionality, an SL master (SIMOLINK interface)
operates in an automation system instead of the dispatcher (peer-to-
peer).
There is always only one SL master in the SIMOLINK ring. All the other
nodes are transceivers.
Nodes
Transceiver
SL master
Direction of data
Fiber-optic cable
Transceiver
Transceiver
Transceiver
Transceiver
Fig. 8.3-12 SIMOLINK ring with SL master
The SL master is the SIMOLINK interface in "higher-level" open-loop
and closed-loop control systems or industrial PCs. As far as the central
control of telegram traffic is concerned, there is no difference between
the dispatcher and the SL master. The task table also specifies in the
case of the SL master which and how many telegrams the SL master
shall send via the bus in one bus cycle.
Differences to the dispatcher:
♦ The applications of the "Master/slave" functionality require a
different mechanism for data transfer than used in the "Peer-to-
peer" functionality.
♦ Flexible address list (address gaps are possible), i.e. the task table
can be configured a lot more freely.
♦ The number of channels used per transceiver can be individually
determined and does not have to be identical. The maximum
number of channels per transceiver is generally restricted to 8.
♦ The SL master itself has 8 channels for data transfer, just as in the
case of the dispatcher or transceiver, however, at the same time it
can use the telegrams with the address and channel number code
of the transceivers for its data transfer.
Bus topology
SL master
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