394 pp.
veda · 7 pp.
MCD3 PROFIBUS communication protocol
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VEDA MC MCD3 RS485 Profibus communication protocol
Contents Installation and configuration...............................................................................................................................................................3 Input parameter (32bytes).....................................................................................................................................................................5 Parameter output (2bytes).....................................................................................................................................................................6
VEDA MC MCD3 low voltage soft starter Installation and configuration This document outlines the Profibus serial communication protocol for digital medium voltage soft starters (MCD3) Profibus serial communication of MCD3 is mainly designed for data exchange. The local bus can read the current parameters of the MCD3 medium voltage soft starter, and can also control the 3 functions of the MCD3 medium voltage soft starter; 1. Start/stop relay 2. Double regulation 3. Fault reset It can be set that the MCD3 medium-voltage soft starter only supports the host computer to read the current parameters of the soft starter, without functional control.
When the MCD3 is equipped with a Profibus module, it contains an internal relay board, the relay (K1) is controlled through the LAN, and its output (normally open) contact can be used to start/stop the soft starter. When configuring the Profibus module, support the standard GSD configuration file. When it is detected that the tripping flag in the Logic status parameter (input parameter #1) is 1, the host should write the stop command (5A00) immediately, so as to avoid the soft starter malfunctioning after the fault is reset! Before connecting the serial communication, the HPMV-DN soft starter must be reliably grounded, otherwise the serial communication hardware may be damaged!
The screenshot of the configuration example: 3
VEDA MC MCD3 low voltage soft starter The screenshot of the catalog example: local bus interface The MCD3 control unit includes a 9-pin socket Set up The PRFIBUS-DP module of the MCD3 medium-voltage soft starter needs to set the communication parameters (modbus), the baud rate is 9600, the even parity, and the station number is 1. baud rate Support all Profibus standard baud rates from 9.6K bit/Sec to 12M bit/Sec terminal The MCD3 Profibus module does not include a termination circuit. When the MCD3 is used as the initial or final node of the network, an external termination circuit must be used. node address The node address should be set before setting the MCD3 module.
The node address can be set between 1-99 by setting the rotary switch on the communication module. 4 Pin Name Socket Shield Connecting to the base 1 Unused 2 Unused 3 B-Line Positive polarity receiving end RxD/transmitting end TxD (according to RS485 standard) 4 Unused 5 Unused 6 Unused 7 Unused 8 A-Line Negative polarity receiving end RxD/transmitting end TxD (according to RS485 standard) 9 Unused