11.2 PROFIBUS communicationTo switch the interface X3 MPI(PtP) to PROFIBUS functionality you haveto activate the according bus functionality by means of a VSC storagemedia from VIPA. By plugging the VSC storage card and then an overallreset the according functionality is activated.Ä Chap. 4.16 ‘Deploymentstorage media - VSD, VSC’ page 111n PROFIBUS is an international standard applicable to an open and serial field bus forbuilding, 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.n PROFIBUS comprises an assortment of compatible versions. The following detailsrefer to PROFIBUS DP.n 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 DPwas designed for high-speed data communication on the sensor-actuator level.n 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 theslaves.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 SiemensCPU. After the transmission of the data to the CPU, the configuration data are internallypassed 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 inthe CPU is not required.Via the PROFIBUS DP master PROFIBUS DP slaves may be coupled to the CPU. TheDP master communicates with the DP slaves and links up its data areas with the addressarea of the CPU. At every POWER ON respectively overall reset the CPU fetches the I/Omapping data from the master. At DP slave failure, the OB 86 is requested. If this is notavailable, the CPU switches to STOP and BASP is set. As soon as the BASP signalcomes from the CPU, the DP master is setting the outputs of the connected periphery tozero. 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 yourslave 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 mastersystem by dragging the CPU 31x from the hardware catalog at Configured stations ontothe 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:n The PROFIBUS interface gets an "active" PROFIBUS node, this means it is involvedin the token rotation.n Via this interface you have PG/OP functions (programming, status request, control,test).n The PROFIBUS interface serves as a gateway (S7 routing).n The bus rotation time can exceed.PROFIBUS DPCPU with DP masterDeployment of the DPmaster with CPUDP slave operationOperating mode DP slave:Test, commissioning,routing (active/passive)VIPA System SLIO Option: Deployment PROFIBUS communicationPROFIBUS communicationHB300 | CPU | 013-CCF0R00 | en | 19-30 255
