A: DP-V0 only allows to write the complete parameter set in one block. DP-V1 offers reading and writing single parameters. HISTORY DP-V0: The bus master sends the parameter block to the slave during power-up of the slave/device. Some control systems also allow to send the parameter block during normal operation. DP-V1: The possibility to read single parameters is an important advantage: If e.g. during commissioning the "Set current" for a motor is modified locally by the electrician, then the control system must be able to read this value to back it up into its data base. The PDP22 (PROFIBUS DP-V1) also allows to suppress the block parameter transfer. This avoids that the parameters are overwritten during power-up of the slave / device. The appropriate parameter is evaluated in the PDP21 / PDP22 and is not sent to the device and cannot be set via the device. The appropriate parameter is 'Ignore V0 Parameters' or 'Use V0-Parameters' resp. and is available in the .GSD file for DP-V1, see chapter "Data Structure, Addressing", "Configuration of a PROFIBUS line with FBP slaves in the bus master ". In former times a separate master class 2 was needed to read and write single parameters. Nowadays most of the control systems offer a class 1 master capable to perform acyclic DP-V1 services to read and write all data types.
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