Danfoss VLT AutomationDrive FC 301, Руководство по конструкции, Страница: 189 / 200

12.12.2 Storage of Data
The coil 65 decimal determines whether data written to
the frequency converter are stored in EEPROM and RAM
(coil 65=1) or only in RAM (coil 65= 0).
12.12.3 IND (Index)
Some parameters in the frequency converter are array
parameters e.g.
3-10 Preset Reference . Since the Modbus
does not support arrays in the holding registers, the
frequency converter has reserved the holding register 9 as
pointer to the array. Before reading or writing an array
parameter, set the holding register 9. Setting holding
register to the value of 2 causes all following read/write to
array parameters to be to the index 2.
12.12.4 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.
12.12.5 Conversion Factor
The different attributes for each parameter can be seen in
the section on factory settings. Since a parameter value
can only be transferred as a whole number, a conversion
factor must be used to transfer decimals.
12.12.6 Parameter Values
Standard data types
Standard data types are int 16, int 32, uint 8, uint 16 and
uint 32. They are stored as 4x registers (40001–4FFFF). The
parameters are read using function 03hex "Read Holding
Registers." Parameters are written using the function 6hex
"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 03hex "Read Holding Registers" and written using
function 10hex "Preset Multiple Registers." Readable sizes
range from 1 register (2 characters) up to 10 registers (20
characters).
12.13 Danfoss FC Control Profile
12.13.1 Control Word According to FC
Profile ( 8-10 Control Profile = 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 12.16 Control Word
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
Table 12.20 Control Word Bits
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
3-10 Preset Reference
according to Table 12.21 .
Programmed ref.
value Parameter Bit 01 Bit 00
1 3-10 Preset
Reference
[0]
0 0
2 3-10 Preset
Reference
[1]
0 1
3 3-10 Preset
Reference
[2]
1 0
4 3-10 Preset
Reference
[3]
1 1
Table 12.21 Reference Values
RS-485 Installation and Set...
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
MG33BF02 - Rev. 2013-12-20 187
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