08.2012 Technology Option F01
Siemens AG 6SE7087-6QX70 (Version AN)
SIMOVERT MASTERDRIVES Compendium Motion Control 9-113
Configuration and starting of traversing operations in positioning and
synchronization mode via a serial interface is simple and convenient,
thanks to the clearly defined message format. It is possible, for
example, to define a positioning offset with a single message ("MDI
block") (in the "Optional Values") and to start the movement
simultaneously with the start command [STA]. The complete traversing
operation is then performed automatically without further intervention
from the host controller. At the end of the traversing operation, the axis
returns a checkback message indicating that the target position has
been reached ("destination reached, axis stationary" status bit [DRS]).
This naturally applies not only to PROFIBUS-DP, but also to other field
buses (CAN bus, USS, etc.).
9.5.2 Parameter transfer (PKW)
Every setting and display parameter of the MASTERDRIVES MC can
be read and modified over a serial interface − with the exception of
SIMOLINK − including all the technology parameters.
The methods used for PKW access are described in detail in the
"Communication" section of this Compendium.
Only one parameter can be accessed in a message frame. It is not
possible to access a new parameter until the old parameter access is
complete ("handshake method").
The new PROFIBUS-DPV1 services and USS protocol also allow
access to all the indices of a parameter in a "long message" (see
below).
When transferring parameters, it should be noted that the U and n
parameters used for the technology are addressed with a "1" in the
most significant bit (bit 15) of the index word.
Example:
Access to U551 => Parameter number in parameter identifier word
= 551
Bit 15 in index word
with DPV1 and USS
or
Bit 7 with cyclical
PROFIBUS services
=1 (PARA PAGE SELECT bit)
Cyclical services
Acyclical services
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