Rs485: Fc Control Profile - Danfoss VLT HVAC Drive FC 102 Design Manual

Appendix
14.10.5 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 14.6 RS485: FC Protocol Parameter
Examples.
14.10.6 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).

14.11 RS485: FC Control Profile

14.11.1 Control Word According to FC
Profile
Master-follower
CTW
Bit
no.: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Illustration 14.16 CW Master-to-Slave
MG16C302
Design Guide
Bit
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
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 Table 14.20.
Programmed
reference value
1
2
Speed ref.
3
4
NOTICE
Make a selection in parameter 8-56 Preset Reference Select
to define how bit 00/01 gates with the corresponding
function on the digital inputs.
Bit 02, DC brake
Bit 02=0 leads to DC braking and stop. Set braking current
and duration in parameter 2-01 DC Brake Current and
parameter 2-02 DC Braking Time.
Bit 02=1 leads to ramping.
Danfoss A/S © 11/2017 All rights reserved.
Bit value=0
Reference value
Reference value
DC brake
Coasting
Quick stop
Hold output frequency
Ramp stop
No function
No function
Ramp 1
Data invalid
No function
No function
Parameter set-up
Parameter set-up
No function
Parameter
[0]
parameter 3-10
Preset Reference
[1]
parameter 3-10
Preset Reference
[2]
parameter 3-10
Preset Reference
[3]
parameter 3-10
Preset Reference
Table 14.20 Control Bits
Bit value=1
External selection lsb
External selection msb
Ramp
No coasting
Ramp
Use ramp
Start
Reset
Jog
Ramp 2
Data valid
Relay 01 active
Relay 02 active
Selection lsb
Selection msb
Reverse
Bit 01 Bit 00
0 0
0 1
1 0
1 1
237
14 14