VIPA 313-6CF03, Руководство пользователя, Страница: 142 / 152

Chapter 7 Deployment Profibus communication Manual VIPA System 300S SPEED7
7-2 HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
Overview
Profibus is an international standard applicable to an open and serial
fieldbus for building, manufacturing and process automation that can be
used to create a low (sensor-/actuator level) or medium (process level)
performance network of programmable logic controllers.
Profibus comprises an assortment of compatible versions. The following
details refer to Profibus-DP.
Profibus-DP is a special protocol intended mainly for automation tasks in a
manufacturing environment. DP is very fast, offers Plug'n'Play facilities and
provides a cost-effective alternative to parallel cabling between PLC and
remote I/O. Profibus-DP was designed for high-speed data communication
on the sensor-actuator level.
The data transfer referred to as "Data Exchange" is cyclical. During one
bus cycle, the master reads input values from the slaves and writes output
information to the slave.
The Profibus DP master is to be configured via the hardware configurator
from Siemens. Therefore you have to choose the Siemens CPU 31xC in
the hardware configurator from Siemens.
The transmission of your project engineering into the CPU takes place by
means of MPI, MMC or Ethernet PG/OP channel. This is internally passing
on your project data to the Profibus master part.
During the start-up the DP master automatically includes his data areas
into the address range of the CPU. A project engineering in the CPU is not
required.
As external storage medium the Profibus DP master uses the MMC
(
M ulti M edia C ard) together with the CPU.
Via the Profibus DP master up to 125 Profibus DP slaves may be coupled
to the CPU. The DP master communicates with the DP slaves and links up
its data areas with the address area of the CPU. There may be created
maximal 1024Byte Input and 1024Byte Output data.
At every POWER ON res. overall reset the CPU fetches the I/O mapping
data from the master. At DP slave failure, the ER-LED is on and the OB 86
is requested. If this is not available, the CPU switches to STOP and BASP
is set. As soon as the BASP signal comes from the CPU, the DP master is
setting the outputs of the connected periphery to zero. The DP master
remains in the operating mode RUN independent from the CPU.
Please regard that the Profibus address 1 is reserved for the system. The
address 1 should not be used!
For the deployment in an super-ordinated master system you first have to
project your slave system with configured in-/output areas. Afterwards you
configure your master system. Assign your slave system to your master
system by dragging the "CPU 31x" from the hardware catalog at
Configured stations onto the master system, choose your slave system and
connect it.
Profibus-DP
CPU with
DP master
Deployment of the
DP-Master with
CPU
Profibus address
1 is reserved
DP slave operation