11.10 RS485: Modbus RTU Parameters
11.10.1 Parameter Handling
The PNU (parameter number) is translated from the
register address contained in the Modbus read or write
message. The parameter number is translated to Modbus
as (10xparameter number) DECIMAL.
11.10.2 Storage of Data
The coil 65 decimal determines whether data written to
the drive is stored in EEPROM and RAM (coil 65=1) or only
in RAM (coil 65=0).
11.10.3 IND
The array index is set in holding register 9 and used when
accessing array parameters.
11.10.4 Text Blocks
Parameters stored as text strings are accessed in the same
way as the other parameters. The maximum text block size
is 20 characters. If a read request for a parameter is for
more characters than the parameter stores, the response is
truncated. If the read request for a parameter is for fewer
characters than the parameter stores, the response is space
filled.
11.10.5 Conversion Factor
Since a parameter value can only be transferred as a whole
number, a conversion factor must be used to transfer
decimals. See
chapter 11.6 RS485: FC Protocol Parameter
.
11.10.6 Parameter Values
Standard data types
Standard data types are int16, int32, uint8, uint16, and
uint32. They are stored as 4x registers (40001–4FFFF). The
parameters are read using function 03 hex read holding
registers. Parameters are written using the function 6 hex
preset single register for 1 register (16 bits), and the
function 10 hex preset multiple registers for 2 registers (32
bits). Readable sizes range from 1 register (16 bits) up to
10 registers (20 characters).
Non-standard data types
Non-standard data types are text strings and are stored as
4x registers (40001–4FFFF). The parameters are read using
function 03 hex Read holding registers and written using
function 10 hex Preset multiple registers. Readable sizes
range from 1 register (2 characters) up to 10 registers (20
characters).
11.11 RS485: FC Control Profile
11.11.1 Control Word According to FC
Profile
Speed ref.
CTW
Master-follower
130BA274.11
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit
no.:
Illustration 11.16 CW Master-to-Slave
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 frequency
Use ramp
06
Ramp stop
Start
07
No function
Reset
08
No function
Jog
09
Ramp 1
Ramp 2
10
Data invalid
Data valid
11
No function
Relay 01 active
12
No function
Relay 02 active
13
Parameter set-up
Selection lsb
14
Parameter set-up
Selection msb
15
No function
Reverse
Explanation of the control bits
Bits 00/01
Bits 00 and 01 are used to select between the 4 reference
values, which are pre-programmed in
parameter 3-10 Preset
Reference
according to
Programmed
reference value
Parameter
Bit 01
Bit 00
1
[0]
parameter 3-10
Preset Reference
0
0
2
[1]
parameter 3-10
Preset Reference
0
1
3
[2]
parameter 3-10
Preset Reference
1
0
4
[3]
parameter 3-10
Preset Reference
1
1
Table 11.20 Control Bits
Appendix
VLT® AutomationDrive FC 361
88
Danfoss A/S © 03/2019 All rights reserved.
MG06K102
11
11
Содержание VLT AutomationDrive FC 361
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