Hitachi SJ Series, User Manual

Page: 502 / 786

14-11
Chapter 14 RS485 Communication
14.4 Description of Each Function code
14.4.1 Reading out the state of coil [01h]
• Read out the state of coil (ON/OFF).
(Example)
To read out the input terminal functions from 1 to 6 of the
inverter with slave address 8, the state of input terminals
are as shown in the right table.
Query
Field Name Example (HEX)
1 Slave address *1) 08
2 Function code 01
3 Coil starting No. (high) *2) 00
4 Coil starting No. (low) *2) 06
5 Number of coils (high) *3) 00
6 Number of coils (low) *3) 06
7 CRC-16 (high) 5C
8 CRC-16 (low) 90
*1) A broadcasting cannot be executed.
*2) Note that the value of starting number is one less than
the actual number.
Specify the value of “(Coil No.) -1”.
*3) Where the number of readout coils is specified to value
0 or value exceeding 32, error code “03h” is returned.
*4) Data as much as the number of data bytes is
transferred.
• Data received as a response indicates the state of coils 7
to
14. The data “17h = 00010111b” received here is read
as shown below, letting coil 7 be the LSB.
In the last coil data, if the readout coil data extends to the
outside the range of defined coil, the coil data beyond the
range is transmitted as “0”.
• Coils 13 and 14 are OFF.
Response
Field Name Example (HEX)
1 Slave address 08
2 Function code 01
3 Data bytes 01
4 Coil data *4) 17
5 CRC-16 (high) 12
6 CRC-16 (low) 1A
When the coil state readout command cannot be executed
normally, see “3.9 Exceptional Responses”.
Coil 14 13 12 11 10 9 8 7
Coil state OFF OFF OFF ON OFF ON ON ON
17h 0 0 0 1 0 1 1 1
Input terminal No. 1 2 3 4 5 6
Coil No. 7 8 9 10 11 12
Terminal state ON ON ON OFF ON OFF
!
A