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11.10.8 Coil Register Addressing
In Modbus, all data are organized in coils and holding
registers. Coils hold a single bit, whereas holding registers
hold a 2-byte word (i.e. 16 bits). All data addresses in
Modbus messages are referenced to zero. The first
occurrence of a data item is addressed as item number
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 Number
Description
Signal Direction
1-16
Frequency converter control word (see table below)
Master to slave
17-32
Frequency converter speed or set-point reference Range 0x0 – 0xFFFF (-200% ...
~200%)
Master to slave
33-48
Frequency converter status word (see table below)
Slave to master
49-64
Open loop mode: Frequency converter output frequency Closed loop mode:
frequency converter feedback signal
Slave to master
65
Parameter write control (master to slave)
Master to slave
0 =
Parameter changes are written to the RAM of the frequency
converter
1 =
Parameter changes are written to the RAM and EEPROM of the
frequency converter.
66-65536
Reserved
Coil
0
1
01
Preset reference LSB
02
Preset reference MSB
03
DC brake
No DC brake
04
Coast stop
No coast stop
05
Quick stop
No quick stop
06
Freeze freq.
No freeze freq.
07
Ramp stop
Start
08
No reset
Reset
09
No jog
Jog
10
Ramp 1
Ramp 2
11
Data not valid
Data valid
12
Relay 1 off
Relay 1 on
13
Relay 2 off
Relay 2 on
14
Set up LSB
15
Set up MSB
16
No reversing
Reversing
frequency converter control word (FC profile)
Coil
0
1
33
Control not ready
Control ready
34
frequency converter not
ready
frequency converter ready
35
Coasting stop
Safety closed
36
No alarm
Alarm
37
Not used
Not used
38
Not used
Not used
39
Not used
Not used
40
No warning
Warning
41
Not at reference
At reference
42
Hand mode
Auto mode
43
Out of freq. range
In frequency range
44
Stopped
Running
45
Not used
Not used
46
No voltage warning
Voltage warning
47
Not in current limit
Current limit
48
No thermal warning
Thermal warning
frequency converter status word (FC profile)
RS-485 Installation and Set...
FC 300 Design Guide
264
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
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