Hitachi SJ700-004LFU2, Инструкция по эксплуатации

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ModBus Mode Communications
Append
ix
B
B–28
When the Write Holding Register command cannot be executed normally, refer to the
exception response.
Loopback Test [08h]:
This function checks a master-slave transmission using any test data. An example follows:
• Send test data to an inverter having slave address “1” and receiving the test data from the
inverter (as a loopback test).
The test subcode is for echo (00h,00h) only and not available to the other commands.
Query:
Note 1: Broadcasting is disabled.
Note 2: The starting coil number is one
less than the number of the coil to
be read first.
Response:
No. Field Name
Example
(hex)
1 Slave address *1 05
2 Function code 06
3 Register start number
(high order) *2 12
4 Register start number
(low order) *2 02
5 Change data (high
order) 00
6 Change data (low order) 32
7 CRC-16 (high order) AD
8 CRC-16 (low order) 23
No. Field Name
Example
(hex)
1 Slave address 05
2 Function code 06
3 Register start number
(high order) 12
4 Register start number
(low order) 02
5 Change data (high
order) 00
6 Change data (low order) 32
7 CRC-16 (high order) AD
8 CRC-16 (low order) 23
Query:
Note 1: Broadcasting is disabled.
Response:
No. Field Name
Example
(hex)
1 Slave address *1 01
2 Function code 08
3 Test subcode (high
order) 00
4 Test subcode (low
order) 00
5 Data (high order) Any
6 Data (low order) Any
7 CRC-16 (high order) CRC
8 CRC-16 (low order) CRC
No. Field Name
Example
(hex)
1 Slave address 01
2 Function code 08
3 Test subcode (high
order) 00
4 Test subcode (low
order) 00
5 Data (high order) Any
6 Data (low order) Any
7 CRC-16 (high order) AD
8 CRC-16 (low order) 23