Danfoss FC 300 Design Manual page 261

FC 300 Design Guide
11.8.8 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
1-16 Adjustable frequency drive control word (see table below)
17-32 Adjustable frequency driver speed or setpoint reference Range 0x0–0xFFFF (-200% ...
~200%)
33-48 Adjustable frequency drive status word (see table below)
49-64 Open-loop mode: adjustable frequency drive output frequency Closed-loop mode: Ad-
justable frequency drive feedback signal
65 Parameter write control (master to slave)
0 =
1 =
66-65536 Reserved
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 Set up MSB
16 No reversing
Adjustable frequency drive control word (FC profile)
Parameter changes are written to the RAM of the adjustable frequency
drive.
Parameter changes are written to the RAM and EEPROM of the adjust-
able frequency drive.
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.BC.22 - VLT ® is a registered Danfoss trademark
11 RS-485 Installation and Set-up
Signal Direction
Master to slave
Master to slave
Slave to master
Slave to master
Master to slave
Coil 0
33 Control not ready
34 Adjustable frequency drive
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
Adjustable frequency drive status word (FC profile)
1
Control ready
Adjustable frequency drive
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
11-15
11