Fuji Electric ALPHA5 Smart, User Manual

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CHAPTER 13 RS-485 COMMUNICATIONS
Modbus RTU Communications
13-13
13

FC 17h (Read out/write in various data)
Only addresses 6000H to 600FH are applicable.
An exception response (exception code: 02H) is returned if an address outside this range is
specified.
(1) Query from the master
Station No. 1 byte
FC 1 byte
･･･
17h
(H)
Read out start
address
2 bytes
(L)
･･･
Specifies the data address.
* Addresses from 6000H to 600FH can be
set.
(H)
No. of registers 2 bytes
(L)
･･･
Specify the number of sets of data n x 2 .
* Up to setting range 1 to 16 for number of
sets of data n
(H)
Write in start
address
2 byte
(L)
･･･ Specify the data address.
* Addresses from
6000H to 6007H can be set.
(H)
･･･
No. of registers 2 byte
(L)
Specify the number of sets of data n x 2 .
* Up to setting range 1 to 8 for number of
sets of data n
No. of data bytes 1 byte ･･･ n x 4
(HH) ･･･
(HL)
(LH)
Data 1
4 bytes
(LL)
Write in data for n sets from the specified
address
* For the data format, refer to the format field
(symbol) in table 4-1.
~ ~
(HH)
(HL)
(LH)
Information
Data n
4 bytes
(LL)
(L)
CRC check
16 bits
(2 bytes) (H)
(2) Response message from slave
Station No. 1 byte
FC 1 byte
･･･ 17h
No. of data bytes
1 byte
･･･ n x 4
(HH)
(HL)
(LH)
Data 1
4 bytes
(LL)
~ ~
･･･
Read out data for n sets from the specified
Address
** Data read out range:
1 to 16
(HH)
(HL)
(LH)
Information
Data n 4 bytes
(LL)
(L)
CRC check
16 bits
(2 bytes)
(H)