Nidec LEROY-SOMER Powerdrive MD2 Commissioning Manual

Contents

Nidec LEROY-SOMER Powerdrive MD2 Commissioning Manual Manual pdf 164 page image

164OPERATION WITH MODBUS RTUCommissioning manual Powerdrive MD2/FX4617 en - 2017.09 / e6 - OPERATION WITH MODBUS RTU6.1 - Serial linkThe POWERDRIVE incorporates as standard a non-isolatedserial link port accessible with a connector.For users who wish to keep the parameter-setting interfacepermanently connected, it is then necessary to add the MDX-MODBUS option with an isolated 2 or 4-wire serial link port. Forfurther details, please refer to the MDX-MODBUS manual ref.4580.6.1.1 - Location and connectionP2 is a standard RS485/RS422 terminal block.Terminals Description1 0V2 Rx\, Tx\’3 Rx, Tx4 24V6.1.2 - ProtocolsThe drive handles the following protocols:- MODBUS RTU- LS NetThe drive automatically recognises the protocol used, and thiscan be read in 11.24 «Serial mode».6.1.3 - Parameter settingDepending on the application, the following parameters needto be modified.11.23: Serial address11.25: Baud rate11.27: Parity type, number of stop bitsFor more information on these parameters, refer to menu 11,section 5.12.2.6.1.4 - NetworkingThe POWERDRIVE serial port allows the drive to communicatewith a 2-wire RS485 network.The network should therefore be connected in a «daisy-chain»(not a star).6.2 - Parameter setting using the PCWith the MDX-SOFT parameter-setting software, setting upthe POWERDRIVE from a PC is very user-friendly.For further details, refer to section 3.6.3 - Control word and status wordPOWERDRIVE run commands can be managed using asingle parameter 06.42, called the «control word».This is because the value of 06.42 corresponds to a word inwhich each bit is associated with a command. The command isenabled when the bit is at 1, and disabled when the bit is at 0.To enable commands using the control word, set 06.43 = 1(run commands via the terminals are no longer active), whenthe drive is disabled.Parameter 10.40, called the status word, is used to grouptogether information about the drive. The value of 10.40corresponds to a 15-bit word, and each bit is associated with adrive status parameter.6.4 - MODBUS RTU6.4.1 - GeneralThe MODBUS RTU protocol is a master-slave type protocol (asingle master per network).Description CharacteristicsNormal physical layer formulti-drop operation 2-wire RS485Bit stream Standard UART asynchronoussymbols with Non-Return toZero (NRZ)SymbolEach symbol consists of:1 start bit8 data bits (least significant bittransmitted first)1 or 2 stop bits according to11.27Baud rate 1200, 2400, 4800, 9600,19200, 38400, 57600, 115200baudsPx1P1 P2 Px2 Px3Connector forMODBUS RTU