Modbus TCP vs Profibus. Fastest and most efficient Protocol. By Carlos on 11 January, 2007 - 11:15 pm. I would class Profibus DP as a fieldbus, like DEvicenet, or CanOpen. In my experience you would have a Master PLC connected to several slaves. I/O blocks, etc. Profibs max speed is 12M. In Modbus, you have to program (or configure) the Modbus Function required for each spoecific exchange between master and slave, specifically the slave address, the location of data in the slave and the amount of registers exchanged, for every Modbus job. In the Siemens communication functions for Modbus,you define these parametersin the mandatory. That is, a ProfiBus system may have more than one class 1 master, but master to master communication is not permitted, except for the granting of bus access rights via token exchange. To illustrate the idea of communication between masters in a ProfiBus DP system, a class 1 master cyclically exchanges data with all of the slaves The terms profibus, profinet, modbus and foundation fieldbus and HART are very common occuring. With PLCs generally Profibus is used.Will some one tell me the major differences between the Dear All,I am not well versed in the communication protocol area. Both the Profibus and the RS485 are standards used in communication during process automation. However, they are used in different aspects of communication. Equustek offers connectivity from DH+ to Ethernet IP, DF1-DH+, Modbus DH+, Ethernet DH+. How to Configure RevPi Gate for PROFIBUS (Core) How to Configure RevPi Gate for PROFINET (Core) Tutorial Modbus RTU Slave; Miscellaneous. Using actuators; you have to make sure that each slave has its own IP address. If 2 or more slaves have the same address, communication errors occur Modbus User's Programming Manual For Despatch ProtocolTM Plus. Chromalox Instruments and Controls A-51643 Rev. 6 10/06/03 i Revision History Rev. Date Description communication security code holding register to address 0. C