Coil Register Addressing - Danfoss VLT AutomationDrive Design Manual

RS-485 Installation and Set...

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).
Coil Number
1-16
17-32
33-48
49-64
65
66-65536
Coil 0
01 Preset reference LSB
02 Preset reference MSB
11 11
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 Set up MSB
16 No reversing
frequency converter control word (FC profile)
264
FC 300 Design Guide
Description
Frequency converter control word (see table below)
Frequency converter speed or set-point reference Range 0x0 – 0xFFFF (-200% ...
~200%)
Frequency converter status word (see table below)
Open loop mode: Frequency converter output frequency Closed loop mode:
frequency converter feedback signal
Parameter write control (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.
Reserved
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.33.BD.02 - VLT
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 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
frequency converter status word (FC profile)
®
is a registered Danfoss trademark
Signal Direction
Master to slave
Master to slave
Slave to master
Slave to master
Master to slave
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