Communications configuring
3-160 System- and communication configuring D7-SYS - SIMADYN D
Edition 12.2003
3.17 SIMOLINK drive coupling
3.17.1 Basic information
SIMOLINK (Siemens Motion Link, SL) is a digital, serial data transfer
protocol using fiber-optic cables as data transfer medium.
The SIMOLINK drive coupling has been developed for extremely fast
and/or rigid cycle transfer of process data (setpoints, actual values,
control and status information)
• between drives (dispatcher, transceiver)
- SIMOVERT MASTERDRIVES MC/VC, or
- SIMOREG DC-MASTER or
• between drives and a higher-level automation system (SL master)
- SIMATIC S7-400 station with FM 458 and EXM448-1 or
- SIMADYN D subrack with PM5/6 and ITSL
• between automation systems (SL master, slave/s)
Where all of the connected nodes are synchronized (SYNC telegram) to
a common system clock.
By transferring a time-equidistant and jitter-free SYNC telegram,
SIMOLINK allows high-dynamic response and all of the connected
individual drives move in absolute position synchronism (e.g. virtual
shaft).
• Max. 201 active nodes (SL master, dispatcher and transceiver,
passive nodes include switches and cable concentrators)
• Bus cycle:
Time between two SYNC telegrams, i.e. the circulating time in the
ringbus
• SYNC telegram:
All of the connected nodes are synchronized after the telegrams were
sent
• Telegram:
32-bit word (double word), occupies one channel for each piece of
process data.
• Nodes read and write their data once every bus cycle.
Bus cycle = system clock cycle Bus cycle = system bus cycle
t
SYNC Pause SYNC PausePause
SYNC telegram SYNC telegram
Telegrams for
data transfer
between the nodes
Telegrams for
data transfer
between the nodes
Fig. 3-52 SIMOLINK telegram data transfer
Introduction
Application
Features
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