Siemens 6RA7013-6DV62, Operating Instructions Manual

Page: 181 / 734

05.05 Start-Up
SIEMENS AG 6RX1700-0AD76
7-23
SIMOREG DC Master Operating Instructions
start up or monitor the installation.
DPM2s support only an
acyclic channel
for transferring parameter data.
The contents of the data frames transferred via these channels are identical to the structure
of the parameter section (PKW) as defined by the USS specification.
The following diagram shows the services and channels supported by a CBP2:
CPU
DriveMonitor
MSCY_C1
MSAC_C1
MSAC_C2
PPO DS 0 DS 100
(Class 1 master) (Class 2 master)
Cyclic channel Acyclic channel
Acyclic channel
PKW
Job/
response PZD
Setpoint/
actual values Diagnosis PKW
Job/
response PKW
Job/
response
PZD
Setpoint/
actual values
Parameter channel Process data channel
Slaves
(e.g. CBP2) may only respond to received messages and are referred to as
passive
nodes
.
PROFIBUS
(
Pro
cess
Fi
eld Bus) combines high baud rates (to RS485 standard) with simple, low-
cost installation. The PROFIBUS baud rate can be selected within a range of 9.6 kbaud to 12
Mbaud and is set for all devices connected to the bus when the bus system is started up.
The bus is accessed according to the token-passing method, i.e. permission to transmit for a
defined time window is granted to the active stations (masters) in a "logical ring". The master can
communicate with other masters, or with slaves in a subordinate master-slave process, within this
time window.
PROFIBUS-
DP
(
D
istributed
P
eripherals) predominantly utilizes the master-slave method and data
is exchanged cyclically with the drives in most cases.
The user data structure for the
cyclic channel MSCY_C1
(see picture above) is referred to as a
Parameter Process(data) Object (
PPO
) in the PROFIBUS profile for variable-speed drives. This
channel is also frequently referred to as the
STANDARD
channel.
The user data structure is divided into two different sections which can be transferred in each
telegram:
PZD section
The process data (PZD) section contains control words, setpoints, status words and actual
values.
PKW section
The parameter section (PKW - Parameter ID Value) is used to read and write parameter
values.
When the bus system is started up, the type of PPO used by the PROFIBUS master to address the
drive is selected. The type of PPO selected depends on what functions the drive has to perform in
the automation network.
Process data are always transferred and processed as priority data in the drive.
Process data are "wired up" by means of connectors of the basic unit (drive) or via technology
board parameters, if these are configured.
Parameter data allow all parameters of the drive to be accessed, allowing parameter values,
diagnostic quantities, fault messages, etc. to be called by a higher-level system without impairing
the performance of the PZD transmission.