140
Example:
Reads out the status signal, fault contents, data link status, and fre-
quency reference from the V7 IP65 (slave 2).
* Twice as much as the number of the reference message.
• Example of Loop-back Test (08H)
A reference message is returned as a response message without
being changed. This function is used to check communication
between the master and the slave. Any arbitrary values can be used
for test codes or data.
Example:
Loop-back test of V7 IP65 (slave 1)
Reference Message
Response Message
(at Normal Operation)
Response Message
(at Fault Occurrence)
Slave address
02H
Slave address
02H
Slave address
02H
Function code
03H
Function code
03H
Function code
83H
Start
number
Upper
00H
Number of data*
08H
Error code
03H
Lower
20H
First
holding
register
Upper
00H
CRC-16
Upper
F1H
Quantity
Upper
00H
Lower
65H
Lower
31H
Lower
04H
Next
holding
register
Upper
00H
CRC-16
Upper
45H
Lower
00H
Lower
F0H
Next
holding
register
Upper
00H
(For error code 03H, refer
to page 151.)
Lower
00H
Next
holding
register
Upper
01H
Lower
F4H
CRC-16
Upper
AFH
Lower
82H
Reference Message
Response Message
(at Normal Operation)
Response Message
(at Fault Occurrence)
Slave address
01H
Slave address
01H
Slave address
01H
Function code
08H
Function code
08H
Function code
89H
Test
code
Upper
00H
Test
code
Upper
00H
Error code
01H
Lower
00H
Lower
00H
CRC-16
Upper
86H
Data
Upper
A5H
Data
Upper
A5H
Lower
50H
Lower
37H
Lower
37H
CRC-16
Upper
DAH
CRC-16
Upper
DAH
Lower
8DH
Lower
8DH