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TM
CUSTOM SOFTWARE DESCRIPTION
ENHANCED MEMOBUS
SOFTWARE
Software Number:
Product:
VSP018090 / VSP018100
V7 Low & High HP
Release Date: 2/15/01 Author:
Base Version: VSP010024 / VSP010103
Part Number: CIMR-V7AMXXXX-034
Ty Phillips
Overview: Support for Memobus function code 06H is added.
Beta Version
Revision History:
Date: 07/01/04, Rev: 04-07 Page 1 of 2 TM.V7SW.034
Background:
All inverters in Yaskawa’s current product line support Memobus communication protocol, which is based on Modbus RTU. However, not every function code of Modbus is supported by Memobus, which can cause incompatibility issues with certain HMIs and PLCs.
Specifically, Modbus function code 06H (single register write) is not supported on standard Yaskawa product. Some HMI/PLC software configuration programs do not permit manual selection of the function code. Therefore, if the user needs to write one word of data to the inverter, function code 06H will automatically be selected instead of function code 10H (multiple register write). Therefore, the inverter will not recognize the query message.
This software adds support for function code 06H to the V7. The correct version must be selected based on inverter capacity as shown:
Detailed Description of Functionality:
Support for function code 06H is added. The format for the message is shown below.
(Example)
Query Message
Slave address
Function code
Data
01H
06H
Register Upper 00H
Address Lower 01H
Setting Upper 00H
Lower 03H
Upper 98H
CRC-16
Lower 0BH
Response Message (Normal)
Slave address
Function code
01H
06H
Register Upper 00H
Address Lower 01H
Setting
Data
Upper 00H
Lower 03H
CRC-16
Upper 98H
Lower 0BH
Response Message (Error)
Slave address 01H
80H + Function Code 86H
Error code 21H
Upper 82H
CRC-16
Lower 78H
Date: 07/01/04, Rev: 04-07 Page 2 of 2 TM.V7SW.034
