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Chapter 4 Explanation of Functions
4 - 136
(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":
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:
Intelligent input terminal 1 2 3 4 5 6
Coil number 7 8 9 10 11 12
Terminal status ON ON ON OFF ON OFF
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."
Query
Field name Sample setting
(hexadecimal)
1 Slave address (*1) 01
2 Function code 08
3 Diagnosis subcode (upper digit) 00
4 Diagnosis subcode (lower digit) 00
5 Data (upper digit) Arbitrary
6 Data (lower digit) Arbitrary
7 CRC-16 code (upper digit) CRC
8 CRC-16 code (lower digit) CRC
*1 This query cannot be broadcasted.
Response
Field name Sample setting
(hexadecimal)
1 Slave address 01
2 Function code 08
3 Diagnosis subcode (upper digit) 00
4 Diagnosis subcode (lower digit) 00
5 Data (upper digit) Arbitrary
6 Data (lower digit) Arbitrary
7 CRC-16 code (upper digit) CRC
8 CRC-16 code (lower digit) CRC
Query
Field name Sample setting
(hexadecimal)
1 Slave address (*1) 05
2 Function code 0F
3 Starting coil number
(upper digit) (*2)
00
4 Starting coil number
(lower digit) (*2)
06
5 Number of coils (upper digit) 00
6 Number of coils (lower digit) 06
7 Number of data bytes (*3) 02
8 Updating data (upper digit) (*3) 17
9 Updating data (lower digit) (*3) 00
10 CRC-16 code (upper digit) DB
11 CRC-16 code (lower digit) 3E
*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.
Response
Field name Sample
setting
(hexadecimal)
1 Slave address 05
2 Function code 0F
3 Starting coil number (upper digit) 00
4 Starting coil number (lower digit) 06
5 Number of coils (upper digit) 00
6 Number of coils (lower digit) 06
7 CRC-16 code (upper digit) 34
8 CRC-16 code (lower digit) 4C