YASKAWA VS MINI J7 User Manual download pdf (Page 74)

 Using MEMOBUS (MODBUS) Communications

Serial communication is available with VS mini using programmable

controller (MEMOCON series) and MEMOBUS. In order to perform serial

communications, RS-485/422 interface card (optional) must be installed.

Refer to MEMOBUS Instruction Manual (Manual No.: TOEZ-C736-70.1)

for details of communications.



MEMOBUS (MODBUS) communications

MEMOBUS system is composed of a single master (PLC) and slaves (1

to 31 VS-mini units).

Communication between master and slave (serial communication) is

controlled according to the master program with the master initiating

communication and the slave responding.

The master sends a signal to one slave at a time. Each slave has a pre-

registered address No., and the master specifies the number and conduct

signal communications. The slave receives the communication to carry

out designated functions and reply to the master.

○ Communications specifications

MEMOCON Series

Example of RS-485

communication

VS mini J7 VS mini J7 VS mini J7

Interface

Synchronization

Communication

parameters

Communication

protocol

Max. number of

inverters that can be

connected

RS-422, RS-485

Asynchronous (Start-stop synchronization)

Baud rate : Selected from 2400/4800/9600/19200 bps

Data length : 8 bits fixed

Parity : Selected from even/odd/none

Stop bits : 1 bit fixed

MEMOBUS (MODBUS) (RTU mode only)

31 units (When using RS-485)

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 122 123

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YASKAWA VS MINI J7 User Manual Page 74