
Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-165
Edition 12.2003
In the
timer mode
(Mode 2), data is directly output after calculation in an
interrupt task Ix which assigns the processing of the SIMOLINK blocks a
higher priority.
SIMOLINK cycle
SIMOLINK cycle
Timer interrupt
Interrupt task Ix
Timer interrupt
Processing time of the
SIMOLINK blocks
Processing time of the
SIMOLINK blocks
Fig. 3-59
Timer-mode (Mode 2)
In these non-synchronous SL-master modes, which exhibit jitter, the
coupled drives cannot be operated with position synchronism if the SYNC
telegram is sent in the time intervals which depend on the actual
configuring. This allows the fastest possible data transfer between SL
master (Mode 1 or 2) and the slave (Mode 0).
The
slave mode
(Mode 0) is used to read and evaluate the bus data
transfer in a drive ring, for e.g. monitoring and diagnostic purposes.
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 telegram
SYNC telegram
Fig. 3-60
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 modules each with two EXM 448-1
expansion modules.
Reading telegrams,
synchronous
Coupling two
automation
systems