Message Examples; Message Examples; Reading Drive Memobus/Modbus Register Contents; Loopback Test - Omron V1000 User Manual

C.9 Message Examples
Below are some examples of command and response messages.
u

Reading Drive MEMOBUS/Modbus Register Contents

Using the function code 03H (Read), a maximum of 16 MEMOBUS/Modbus registers can be read out at a time.
The following table shows message examples when reading status signals, error details, data link status, and frequency
references from the slave 2 drive.
Command Message
Slave Address 02H
Function Code 03H
Upper 00H
Starting No.
Lower 20H
Upper 00H
Data Quantity
Lower 04H
Upper 45H
CRC-16
Lower F0H
u

Loopback Test

Function code 08H performs a loopback test. This test returns a response message with exactly the same content as the
command message and can be used to check the communications between the master and slave. User-defined test code
and data values can be set.
The following table shows a message example when performing a loopback test with the slave 1 drive.
Command Message
Slave Address 01H
Function Code 08H
Upper 00H
Test Code
Lower 00H
Upper A5H
Data
Lower 37H
Upper DAH
CRC-16
Lower 8DH
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
Response Message (normal)
Slave Address
Function Code
Data Quantity
Upper
1st storage
register
Lower
Upper
Next storage
register
Lower
Upper
Next storage
register
Lower
Upper
Next storage
register
Lower
Upper
CRC-16
Lower
Response Message (normal)
Slave Address 01H
Function Code 08H
Upper 00H
Test Code
Lower 00H
Upper A5H
Data
Lower 37H
Upper DAH
CRC-16
Lower 8DH
Response Message (fault)
02H Slave Address
03H Function Code
08H Error Code
00H
CRC-16
65H
00H
00H
00H
00H
01H
F4H
AFH
82H
Response Message (fault)
Slave Address
Function Code
Error Code
CRC-16
C.9 Message Examples
02H
83H
03H
Upper F1H
Lower 31H
01H
89H
01H
Upper 86H
Lower 50H
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