Chapter 5 Deployment CPU 31x with Profibus Manual VIPA System 300V
5-2 HB130E - CPU - Rev. 11/50
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 configure via the hardware configurator from
Siemens. Therefore you have to choose the Siemens-CPU 315-2AF03 in
the hardware configurator from Siemens.
The transmission of your project engineering into the CPU takes place by
means of MPI. This is internally passing on your project data to the
Profibus master part. During the start-up the DP master automatically
mappes his data areas into the address area of the CPU. A configuration of
the CPU part is not required. As external storage medium the Profibus DP
master uses the MultiMediaCard (MMC) 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 as CPU 315-2DP (6ES7 315-2AF03-0AB0/V1.2)
in Slave operation with configured in-/output areas. Afterwards you
configure your master system. Assign your slave system to your master
system. The assignment to your master systems happens for VIPA CPUs
31x with DP slave/master via Configured stations and for VIPA CPUs 31x
with DP slave via VIPA GSD file. Here drag the slave system from the
hardware catalog and drop it on the master system, 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
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