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The hardware of the PROFIBUS network consists of master stations, slave stations, network components, and network configuration and diagnostic tools.PROFIBUS – DP devices can be classified into three different types of stations.
(1) Class 1 DP Master Station Class 1 DP Master Station (DPM1) is the central controller of the system, DPM1 cyclically exchanges information with DP slave stations within a predetermined cycle and controls and manages bus communication. DPM1 can send parameters to DP slave stations, read diagnostic information from the slaves, and inform them of its operational status through global control commands. Furthermore, it can send control commands to individual slaves or slave groups to synchronize output and input data. The following devices can serve as Class 1 DP master stations: 1) PLCs integrated with DP interfaces, such as CPU 315 -2DP and CPU 313C -2DP. 2) CPUs and communication processors that support DP master station functions (CP). 3) PCs equipped with PROFIBUS network cards, such as WinAC controllers. The software functionality allows the PC to act as a Class 1 master station or a Class 2 master station for programming and monitoring, using network cards like CP 5511, CP 5611, and CP 5613. 4) IE/PB link modules that connect industrial Ethernet and PROFIBUS – DP. 5) Master station modules for ET 200S/ET 200X. (2) Class 2 DP Master Station Class 2 DP Master Station (DPM2) is the programming, diagnostic, and management device in the DP network. PCs and operator panels/ touch screens ( OP/TP) can act as Class 2 master stations. DPM2 not only has the functions of a Class 1 master station but can also read input/output data and current configuration data from DP slave stations while communicating with Class 1 DP master stations, and can assign new bus addresses to the DP slave stations. (3) DP Slave Station DP slave stations are peripheral devices that collect input information and send output information, exchanging user data only with their DP master stations, reporting local to the master station. Individual models of ET 200 can be equipped with dedicated CPU modules. Some PROFIBUS communication processors (CP) can also act as DP slave stations. PLCs can serve as intelligent slaves for PROFIBUS. (4) Other field devices with PROFIBUS – DP interfaces Siemens’ SINUMERIK CNC systems, SITRANS field instruments, frequency converters, and SIMOREG DC – MASTER DC drive devices all feature PROFIBUS – DP interfaces or optional DP interface cards and can act as DP slave stations. Other companies’ input/ output devices, sensors, actuators, or other intelligent devices equipped with DP interfaces can also connect to the PROFIBUS – DP network. Class 1, Class 2 DP master stations or DP slave stations can be combined in a single device to form a DP composite device. |
