Configuring
Application Module FM 458-1 DP - User Manual 4-43
A5E01078222-02 Edition 03.2009
With each received SYNC telegram, the SIMOLINK module initiates that
the configured interrupt task Ix is processed. If it is used as the receive
section for fast data transfer between SL master and slave, all of the
telegrams can be read and processed. Furthermore, it is possible to write
a max. 8 telegrams, in order to, for example, transfer signals to the SL
master.
SIMOLINK cycle
Processing time of the
SIMOLINK blocks
Processing time of the
SIMOLINK blocks
SIMOLINK cycle
Processing time of the
SIMOLINK blocks
Interrupt task Ix
SYNC telegram SYNC telegramSYNC telegram
Fig. 4-22 Slave mode (Mode 0)
In order to send data between two automation systems via SIMOLINK,
which exceeds the amount of data using 8 telegrams, two independent
SIMOLINK rings are required. This means that every node can be
configured once as SL master to send in one ring and as slave to receive
in the other ring. This technique is used, for example, to achieve
synchronized processing and
extremely fast data transfer
between two SIMATIC FM 458-1 DP modules each with two EXM 448-1
or one EXM 448-2 expansion modules.
When selecting the operating mode, it should be noted, that interrupt task
processing can interrupt cyclic tasks at any time. This can influence the
timing. For the non-synchronous mode, the SIMOLINK cycle is delayed
and for the external cyclic mode, T0 must be adapted to prevent
computation time overflow or multiple sending of the same values which
have not been re-calculated.
Synchronization to the base sampling time T0 can be set in 100 µs
intervals while interrupt tasks are initiated by the SYNC telegram,
dependent on the telegram duration.
Coupling two
automation
systems
Cyclic or interrupt
task ?
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