Siemens Simovert Masterdrives Compendium page 498

12.2010
Rules for the
exchange of data
NOTE
NOTICE
Siemens AG 6SE7087-6QX70 (Version AM)
SIMOVERT MASTERDRIVES
♦ Each transceiver can read a maximum of 8 telegrams, however, the
difference to the peer-to-peer functionality is that only telegrams
which have an address corresponding to the address of the node or
the master address 0 are read.
Note: These telegrams must, of course, be entered in the task table
of the master.
♦ As in the case of the peer-to-peer functionality, each transceiver can
only write data on telegrams whose telegrams have the address of
the transceiver.
♦ The master can read and write on all telegrams.
The master can implement data exchange between two transceivers by
transferring the received data of one transceiver to the telegrams (=
address) of the other.
Every transceiver can also read the telegrams of any other node.
However, whether the read data are receive or transmit data, depends
on where the respective nodes are situated in the SIMOLINK ring
(definite data traffic in the SIMOLINK ring).
The SIMADYN-D master can be operated in different SIMOLINK
operating modes.
Modes 3 to 5 are suitable for error-free data traffic with
MASTERDRIVES. Especially when using the asynchronous mode (= 1)
problems can arise on the MASTERDRIVES MC/VC because the
hardware interrupt generated by the bus cycle might not be equidistant
and hardware interrupts triggered in too quick succession will cause a
computation time overflow in the MASTERDRIVES MC/VC basic unit.
Compendium Motion Control
Communication / SIMOLINK
8.3-27