216AB61 HESG324013R0100 HESG435572P1 ABB PLC
The data communication between the 216AB61 HESG324013R0100 HESG435572P1 (DP Master Class 1) and its assigned slaves is automatically handled by the 216AB61 HESG324013R0100 HESG435572P1 in a defined, recurring sequence. With each user data transfer, the master can write up to 244 bytes of output data to the slave and read up to 244 bytes of input data from the slave. The Data is read and written synchronously in one procedure.The data communication between the DPM1 and the slaves is divided into three phases:
parameterization, configuration and data transfer. Before the master includes a DP slave in the data transfer phase, a check is run during the parameterization and configuration phase to ensure that the configured set point configuration matches the actual device configuration.During this check, the device type, format and length information and the number of inputs and outputs must also correspond. This provides you with reliable protection against parameterization errors.
216AB61 HESG324013R0100 HESG435572P1 ABB PLC
216AB61 HESG324013R0100 HESG435572P1 ABB PLC
Monitoring the DP-V0 Communication
The cyclic communication between the 216AB61 HESG324013R0100 HESG435572P1 and the slaves is monitored by the master and the slaves itself. If the DPM master unit detects a failure in the communication with a slave, it will indicate the corresponding slave as disturbed.On slave side the communication with the master is controlled via the watchdog. If no data communication with the master occurs within the watchdog control interval, the slave automatically switches its outputs to the fail-safe state.The key feature of version 216AB61 HESG324013R0100 HESG435572P1 is the extended function for acyclic data communication. The acyclic data communication is mainly used for configuration and parameterization purpose. With the acyclic DP-V1 read and write services the master can read or write any desired data to and from the slave. The data is addressed by slot, index and length. Each data block can be up to 240 bytes.
216AB61 HESG324013R0100 HESG435572P1 ABB PLC
216AB61 HESG324013R0100 HESG435572P1 ABB PLC
The physical medium for 216AB61 HESG324013R0100 HESG435572P1 is RS-485, which allows 32 nodes in a single segment and 125 nodes in a network using 4 segments. Segments must be separated by using Repeater.The PROFIBUS interface checks input signal for poll requests from master and detects automatically requested baud rate. It is able to work with baud rates up to 1.5M. Cable length may vary from 80-1200 m depending on transmission speed and repeater type in use. Cable length can be extended using fiber optic modems (yielding a more robust network).See reference document [4] for more details on cable connections and wiring.
216AB61 HESG324013R0100 HESG435572P1 ABB PLC
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