8
Option: PROFIBUS communication
8.1 Overview
To switch the interface X3 MPI(PtP) to PROFIBUS functionality you have
to activate the according bus functionality by means of a VSC storage
media from VIPA. By plugging the VSC storage card and then an overall
reset the according functionality is activated.
ment storage media - VSD, VSC’ on page 83
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PROFIBUS is an international standard applicable to an open and serial field bus for
building, manufacturing and process automation that can be used to create a low
(sensor-/actuator level) or medium (process level) performance network of program-
mable logic controllers.
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PROFIBUS comprises an assortment of compatible versions. The following details
refer to PROFIBUS DP.
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PROFIBUS DP is a special protocol intended mainly for automation tasks in a manu-
facturing 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.
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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
slaves.
The PROFIBUS DP master is to be configured in the hardware configurator from Sie-
mens. Here the configuration happens by the sub module X1 (MPI/DP) of the Siemens
CPU. After the transmission of the data to the CPU, the configuration data are internally
passed on to the PROFIBUS master part. During the start-up the DP master automati-
cally includes his data areas into the address range of the CPU. Project engineering in
the CPU is not required.
Via the PROFIBUS DP master 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. At every POWER ON respectively overall reset the CPU fetches the I/O
mapping data from the master. At DP slave failure, 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.
For the deployment in a super-ordinated master system you first have to project your
slave system as Siemens CPU in slave operation mode with configured in-/output areas.
Afterwards you configure your master system. Couple 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.
There is the possibility to enable the option
‘Test, commissioning, routing’
in the hard-
ware configuration by means of the properties dialog of the PROFIBUS via the register
‘Operating mode’
at
‘DP slave’
. The activation affects as follows:
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The PROFIBUS interface gets an "active" PROFIBUS node, this means it is involved
in the token rotation.
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Via this interface you have PG/OP functions (programming, status request, control,
test).
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The PROFIBUS interface serves as a gateway (S7 routing).
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The bus rotation time can exceed.
PROFIBUS DP
CPU with DP master
Deployment of the DP
master with CPU
DP slave operation
Operating mode DP slave:
Test, commissioning,
routing (active/passive)
VIPA System SLIO
Option: PROFIBUS communication
Overview
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