Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 73

RS-485 Installation and Set...
zero. For example: The coil known as 'coil 1' in a
programmable controller is addressed as coil 0000 in the
data address field of a Modbus message. Coil 127 decimal
is addressed as coil 007EHEX (126 decimal).
Holding register 40001 is addressed as register 0000 in the
data address field of the message. The function code field
already specifies a 'holding register' operation. Therefore,
the '4XXXX' reference is implicit. Holding register 40108 is
addressed as register 006BHEX (107 decimal).
Coil Description
Number
1-16 Frequency converter control word
(see table below)
17-32 Frequency converter speed or set-
point reference Range 0x0 – 0xFFFF
(-200% ... ~200%)
33-48 Frequency converter status word (see
7 7
table below)
49-64 Open loop mode: Frequency
converter output frequency
Closed loop mode: Frequency
converter feedback signal
65 Parameter write control (master to
slave)
0 =
1 =
66-6553 Reserved
6
Coil 0
01 Preset reference LSB
02 Preset reference MSB
03 DC brake
04 Coast stop
05 Quick stop
06 Freeze freq.
07 Ramp stop
08 No reset
09 No jog
10 Ramp 1
11 Data not valid
12 Relay 1 off
13 Relay 2 off
14 Set up LSB
15
16 No reversing
Table 7.1 Frequency Converter Control Word (FC Profile)
72
VLT HVAC Basic Drive Design Guide
Signal Direction
Master to slave
Master to slave
Slave to master
Slave to master
Master to slave
Parameter changes are written
to the RAM of the frequency
converter
Parameter changes are written
to the RAM and EEPROM of
the frequency converter.
1
No DC brake
No coast stop
No quick stop
No freeze freq.
Start
Reset
Jog
Ramp 2
Data valid
Relay 1 on
Relay 2 on
Reversing
MG.18.C2.02 - VLT
Coil 0
33 Control not ready
34 Frequency converter not
ready
35 Coasting stop
36 No alarm
37 Not used
38 Not used
39 Not used
40 No warning
41 Not at reference
42 Hand mode
43 Out of freq. range
44 Stopped
45 Not used
46 No voltage warning
47 Not in current limit
48 No thermal warning
Table 7.2 Frequency Converter status word (FC profile)
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is a registered Danfoss trademark
1
Control ready
Frequency converter ready
Safety closed
Alarm
Not used
Not used
Not used
Warning
At reference
Auto mode
In frequency range
Running
Not used
Voltage warning
Current limit
Thermal warning