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
Summary of Contents for SJ700D-004L
Page 16: ...Contents Appendix Appendix A 1 Index Index Index 1 ...
Page 44: ...Chapter 2 Installation and Wiring 2 23 Memo ...
Page 70: ...Chapter 3 Operation 3 25 Memo ...
Page 248: ...Chapter 5 Error Codes 5 11 Memo ...
Page 256: ...Chapter6 Maintenance and Inspection 6 7 Memo ...
