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Chapter 4
(v) Performing a loopback test [08h]
The loopback test function is used to check the communication between the external control system (master) and the
inverter (slave).
(Example)
When performing a loopback test with the inverter at slave address "1":
Query
Field name
1
Slave address (*1)
2
Function code
3
Diagnosis subcode (upper digit)
4
Diagnosis subcode (lower digit)
5
Data (upper digit)
6
Data (lower digit)
7
CRC-16 code (upper digit)
8
CRC-16 code (lower digit)
*1 This query cannot be broadcasted.
The diagnosis subcode only conforms to the echoing of query data (00h, 00h). It cannot be used for other commands.
(vi) Writing data to multiple coils [0Fh]
This function rewrites data in sequential coils.
(Example)
When updating the status of the intelligent input terminals [1] to [6] of the inverter at slave address "5":
The status of the intelligent input terminals is updated to the status shown in the following table:
Query
Field name
1
Slave address (*1)
2
Function code
3
Starting coil number
(upper digit) (*2)
4
Starting coil number
(lower digit) (*2)
5
Number of coils (upper digit)
6
Number of coils (lower digit)
7
Number of data bytes (*3)
8
Updating data (upper digit) (*3)
9
Updating data (lower digit) (*3)
10
CRC-16 code (upper digit)
11
CRC-16 code (lower digit)
*1 If this query is broadcasted, no inverter will return any
response.
*2 Note that the starting coil number is 1 less than the actual
coil number of the coil to which the data is to be written
first.
*3 The updating data consists of the upper and lower digits.
Even when updating an odd number of data bytes, add 1 to
the number of data bytes to make it an even number before
specifying the number of data bytes.
If the function to write data to multiple coils cannot be executed normally, the inverter will return an exception
response. For details, see Item (viii), "Exception response."
Sample setting
(hexadecimal)
01
08
00
00
Arbitrary
Arbitrary
CRC
CRC
Intelligent input terminal
Coil number
Terminal status
Sample setting
(hexadecimal)
05
0F
00
06
00
06
02
17
00
DB
3E
Explanation of Functions
Response
Field name
1
Slave address
2
Function code
3
Diagnosis subcode (upper digit)
4
Diagnosis subcode (lower digit)
5
Data (upper digit)
6
Data (lower digit)
7
CRC-16 code (upper digit)
8
CRC-16 code (lower digit)
1
2
3
4
7
8
9
10
ON
ON
ON
OFF
Response
Field name
1
Slave address
2
Function code
3
Starting coil number (upper digit)
4
Starting coil number (lower digit)
5
Number of coils (upper digit)
6
Number of coils (lower digit)
7
CRC-16 code (upper digit)
8
CRC-16 code (lower digit)
4-136
Sample setting
(hexadecimal)
01
08
00
00
Arbitrary
Arbitrary
CRC
CRC
5
6
11
12
ON
OFF
Sample setting
(hexadecimal)
05
0F
00
06
00
06
34
4C
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