Siemens SIMOVERT MASTERDRIVES Manual page 432

Communication / SIMOLINK
Peer-to-peer
functionality
Master/slave
functionality
NOTE
8.3-4
This field of application describes all applications for which there is no
dedicated logical master for distributing information via SIMOLINK. A
typical application example here today is the "Continuous material
throughput" which is implemented with the peer-to-peer protocol, in
which drives have equal rights in a logical sense (peer-to-peer) in their
exchange of information with each other. In accordance with the
definition of the term "peer-to-peer", (communication between equals),
this function is described as the "Peer-to-peer" functionality on
SIMOLINK. This functionality enables extremely fast, synchronized and
absolutely freely selectable transfer of data (no restrictions imposed by
the physical bus configuration as in the peer-to-peer protocol) between
MASTERDRIVES MC/VC units. The system needs to be designed with
a "timing generator" for generating the telegram traffic and which keeps
the bus system fully functional. The SIMOLINK dispatcher provides the
interface to this function in the converter. The term "Dispatcher" is used
to describe the principle characteristic of this interface: independent,
constant dispatching of telegrams. The interfaces in the other
MASTERDRIVES MC/VC units on SIMOLINK operate as
"Transceivers".
The term "Transceiver" is made up of the words "Transmitter" and
"Receiver". It means that a transceiver can receive and then send
telegrams, but it cannot initiate telegram traffic itself (main difference to
the dispatcher).
In this case, a central station (logical master) supplies all the other
nodes (logical slaves) on the bus system with information (control bits,
setpoints, etc.) This function is referred to hereafter as the
"Master/slave" functionality. It refers to the logics of data transfer
between the nodes on SIMOLINK. The system needs to be configured
with a SIMOLINK interface in the central station (master) in this
application field. This interface is both the logical master for data
transfer and the initiator and monitor for telegram traffic on SIMOLINK
(= dispatcher function). This interface, including its functions contained
in an automation system, is referred to as the "SIMOLINK master".
The interfaces in the other nodes, e.g. in the converters, are
"SIMOLINK transceivers".
There is always only one node with a dispatcher function in the
SIMOLINK ring. This is either a SIMOLINK board with dispatcher
parameterization or a SIMOLINK master.
6SE7087-6QX70 (Version AG)
Compendium Motion Control
05.2006
Siemens AG
SIMOVERT MASTERDRIVES