Read/Write Multiple Registers (17 Hex); Fc Control Profile; Control Word According To Fc Profile (8-10 Protocol = Fc Profile) - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS485 Installation and Set-...
Field name
Slave address
Function
Starting address HI
Starting address LO
3 3
Number of registers HI
Number of registers LO
Error check (CRC)
Table 3.23 Response
3.10.4 Read/Write Multiple registers (17
hex)
Description
This function code combines 1 read operation and 1 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 0.
Example of a request to set parameter 1-24 Motor Current
to 738 (7.38 A) and read parameter 3-03 Maximum
Reference which has value 50000 (50000 Hz):
Field name
Follower Address
Function
Read Starting Address HI
Read Starting Address LO
Quantity to Read HI
Quantity to Read LO
Write Starting Address HI
Write Starting address LO
Quantity to Write HI
Quantity to Write LO
Write Byte Count
Write Registers Value HI
Write Registers Value LO
Write Registers Value HI
Write Registers Value LO
Error Check (CRC)
Table 3.24 Query
Response
The normal response contains the data from the group of
registers that were read. The byte count field specifies the
quantity of bytes to follow in the read data field.
30
®
VLT DriveMotor FCP 106/FCM 106
Example (hex)
01
10
04
19
00
02
–
Example (hex)
01
17
0B (Register address 3029)
D5 (Register address 3029)
00
02
(parameter 3-03 Maximum
Reference is 32 bits long,
that is, 2 registers)
04 (Register address 1239)
D7 (Register address 1239)
00
02
04
00
00
02
0E
–
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Field name
Follower Address
Function
Byte Count
Read Registers Value HI
Read Registers Value LO
Read Registers Value HI
Read Registers Value LO
CRC
Table 3.25 Response

3.11 FC Control Profile

3.11.1 Control Word According to FC Profile
(8–10 Protocol = FC profile)
Master-follower
CTW
Bit
no.:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Illustration 3.20 Control Word According to FC Profile
Bit Bit value=0 Bit value=1
00 Reference value External selection lsb
01 Reference value External selection msb
02 DC brake Ramp
03 Coasting No coasting
04 Quick stop Ramp
05 Hold output Use ramp
frequency
06 Ramp stop Start
07 No function Reset
08 No function Jog
09 Ramp 1 Ramp 2
10 Data invalid Data valid
11 Relay 01 open Relay 01 active
12 Relay 02 open Relay 02 active
13 Parameter set-up Selection lsb
15 No function Reverse
Table 3.26 Control Word According to FC Profile
Explanation of the control bits
Bits 00/01
Bits 00 and 01 are used to select among the 4 reference
values, which are pre-programmed in parameter 3-10 Preset
Reference according to Table 3.27.
Example (hex)
01
17
04
00
00
C3
50
–
Speed ref.
MG03N202