INVT SV-DA200 Series User Manual

SV-DA200 series AC servo drive Communication
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8 Communication
8.1 Overview
SV-DA200 servo drives provide RS485, CANopen and PROFIBUS-DP communication interface.
Asynchronous serial half-duplex communication between 31 servo drives and NC or PLC is available
through the RS485 interface; asynchronous serial half-duplex communication between 127 servo
drives and NC or PLC is available through the CAN interface; asynchronous serial half-duplex
communication between 100 servo drives and NC or PLC is available through the PROFIBUS-DP
interface.
 Read/write the function parameters of the servo drives
 Monitor the operating state of the servo drives
 Form a multi-axis control system
There are three kinds of communication interface USB, CANopen and Ethernet between the servo
drive and PC. And the PC has functions of parameter calibration, condition monitoring and data
access to the drive. External communication card is needed for Ethernet communication.
8.2 RS485 communication protocol
The SV-DA200 provide RS485 communication interface. It adopts international standard ModBus
communication protocol to perform master-slave communication. The user can realize centralized
control through PC/PLC, upper control PC, etc. (set the control command, running frequency of the
inverter, modify relevant function codes, monitor and control the operating state and fault information
of the inverter and so on) to adapt specific application requirements.
8.2.1 Protocol content
The Modbus serial communication protocol defines the frame content and usage format in
asynchronous transmission which includes: master polling, and the format of the broadcast frame and
the slave answering frame. The frame of the master includes: the slave address (or the broadcast
frame), commands, digit and error checkout. The slave answering also applies the same structure:
action confirmation, digit returning and error checkout. If there is a mistake during the frame receiving
of the slave or the slave cannot finish the action which the master requires, it will respond an error
frame to the master as a response.
8.2.2 Protocol instructions
The communication protocol of the SV-DA200 series servo drives is an asynchronous serial
Master-Slave communication protocol. The master is the only device in the network to build up the
protocol (named as inquiry/command), while the other devices (the slaves) can respond to or do
action to the inquiry/command of the master through providing digits. The master in this manual
means PC, industrial control devices and PLC. The slaves mean the servo drives and other control
devices with the same communication protocol. The master can communicate with a certain salve, as
well as, send broadcast message to all slaves. For the separately-visiting inquiry/command of the
master, the slave should return a message as the response. While for the broadcast message, the

INVT SV-DA200 Series Specifications

General

Brand	INVT
Model	SV-DA200 Series
Category	Servo Drives
Language	English