Siemens Simovert Masterdrives Compendium page 392

Communication / PROFIBUS
8.2.7.2 Process data interconnection in the units
Definition
NOTE
Alter process data interconnection?
no
Interconnect receive channel
Interconnect reply channel:
Other relevant CBP
NOTICE
8.2-62
Process data interconnection involves the linking up of setpoints and
control bits to the RAM interface. The transferred process data only
become effective when the used bits of the control words as well as the
setpoints, status words and actual values are allocated (connected) to
the dual-port RAM interface.
The CBP stores the received process data at fixed pre-determined
addresses in the dual-port RAM. Each item of process data (PZDi, i = 1
to 10) is assigned a connector (e.g. 3001 for PZD1). The connector is
also used to determine whether the PZDi (i = 1 to 10) is a 16-bit value or
a 32-bit value.
With the help of selector switches (e.g. P554.1 = selector switch for bit 0
of control word 1), the setpoints or the individual bits of the control words
can be assigned to a particular PZDi in the dual-port RAM. In order to do
this, the connector belonging to the required PZDi is assigned to the
selector switch.
In function classes CUPM, CUMC, CUVC and Compact PLUS, the
control words STW1 and STW2 are also available in bit form on so-called
binectors (explanations of BICO systems can be found in Chapter 4
"Function Blocks and Parameters").
yes
control words,
setpoints
status words,
actual values
parameters
Fig. 8.2-20 Procedure for changing process data
Rewiring from 16 to 32 bit and vice versa should not be done while the
equipment is in operation, because the changeover takes several
milliseconds, during which time the data on the bus are not consistent
(high and low can change places).
"Process-data interconnection,
"Process-data interconnection,
actual-value channel"
"Process-data monitoring"
6SE7087-6QX70 (Version AK)
Compendium Motion Control
See section
setpoint channel"
See section
See section
Siemens AG
SIMOVERT MASTERDRIVES
09.2008