SIEMENS
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Siemens NC 62 · 2016
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SINAMICS S120 drive system
Communication
PROFIBUS
■
Function
Functions on PROFIBUS DP
The functional scope can differ between DP masters and
DP slaves. The functional scope is different for DP-V0, DP-V1
and DP-V2.
DP-V0
The DP master functions (DP-V0) comprise of the functions
"Configuration", "Parameter assignment", "Read diagnostic data"
as well as "Cyclic reading of input data/actual values" and
"Writing output data/setpoints".
DP-V1
The additional DP function expansions (DP-V1) make it possible
to perform acyclic read and write functions as well as process-
ing cyclic data communication. This type of slave must be sup-
plied with extensive parameterization data during start-up and
during normal operation. These acyclically transferred parame-
terization data are only rarely changed in comparison to the
cyclic setpoints, actual values, and measured values, and are
transferred at lower priority in parallel with the cyclic high-speed
user data transfer. Detailed diagnostic information can be trans-
ferred in the same way.
DP-V2
The extended DP master functions (DP-V2) mainly comprise
functions for isochronous operation and direct data exchange
between DP slaves.
Isochronous mode is implemented by means of an equidistant
clock signal in the bus system. This cyclic, equidistant cycle is
sent by the DP master to all bus nodes in the form of a Global
Control Telegram. Master and slaves can then synchronize their
applications with this signal. The jitter of the clock signal from
cycle to cycle is less than 1
µ
s.
The "publisher/subscriber" model is used to implement slave-to-
slave communication. Slaves declared as publishers make their
input data/actual values and measured values available to other
slaves, the subscribers, for reading. This is performed by send-
ing the response frame to the master as a broadcast. Slave-to-
slave communication is therefore a cyclic process.
SINAMICS and PROFIBUS DP
The SINAMICS S120 drive system can operate only as a DP
slave and supports all communication functions, i.e. DP-V0,
DP-V1 and DP-V2.
SINUMERIK and PROFIBUS DP
The SINUMERIK 840D sl control system functions as the DP
master for drive axes and supports all DP-V0, DP-V1 and DP-V2
communication functions. SINAMICS S120 drives as well as
distributed hydraulic axes can be linked as slaves to these
systems. The decentralized hydraulic axes can only be used
with isochronous PROFIBUS.
© Siemens AG 2016