Preset Single Register (06 Hex); Preset Multiple Registers (10 Hex); Read/Write Multiple Registers (17 Hex) - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS-485 Installation and Set...

3.10.2 Preset Single Register (06 hex)

Description
This function presets a value into a single holding register.
Query
The query message specifies the register reference to be
preset. Register addresses start at zero, that is, register 1 is
addressed as 0.
Example: Write to parameter 1-00 Configuration Mode,
register 1000.
Field Name Example (hex)
Follower Address 01
Function 06
Register Address HI 03 (Register address 999)
Register Address LO E7 (Register address 999)
Preset Data HI 00
Preset Data LO 01
Error Check (CRC) -
Table 3.19 Query
Response
The normal response is an echo of the query, returned
after the register contents have been passed.
Field Name Example (hex)
Follower Address 01
Function 06
Register Address HI 03
Register Address LO E7
Preset Data HI 00
Preset Data LO 01
Error Check (CRC) -
Table 3.20 Response

3.10.3 Preset Multiple Registers (10 hex)

Description
This function presets values into a sequence of holding
registers.
Query
The query message specifies the register references to be
preset. Register addresses start at zero, that is, register 1 is
addressed as 0. Example of a request to preset 2 registers
(set 1-24 Motor Current to 738 (7.38 A)):
®
VLT DriveMotor FCP 106 and FCM 106 Programming Guide
Field Name
Follower Address
Function
Starting Address HI
Starting Address LO
No. of Registers HI
No. of registers LO
Byte Count
Write Data HI
(Register 4: 1049)
Write Data LO
(Register 4: 1049)
Write Data HI
(Register 4: 1050)
Write Data LO
(Register 4: 1050)
Error Check (CRC)
Table 3.21 Query
Response
The normal response returns the follower address, function
code, starting address, and quantity of registers preset.
Field Name
Follower Address
Function
Starting Address HI
Starting Address LO
No. of Registers HI
No. of registers LO
Error Check (CRC)
Table 3.22 Response
3.10.4 Read/Write Multiple registers (17
Description
This function code performs a combination of one read
operation and one write operation in a single MODBUS
transaction. The write operation is performed before the
read.
Query
The query message specifies the starting address and
number of holding registers to be read as well as the
starting address, number of holding registers, and the data
to be written. Holding registers are addressed starting at
zero.
Example of a request to set 1-24 Motor Current to 738 (7.38
A) and read parameter 3-03 Maximum Reference which has
value 50000 (50,000 Hz):
MG03N102 - Rev. 2013-12-02
Example (hex)
01
10
04
07
00
02
04
00
00
02
E2
-
Example (hex)
01
10
04
19
00
02
-
HEX)
3 3
29