Coil Register Addressing - Danfoss VLT AQUA Drive FC 202 Design Manual

RS-485 Installation and Set...

7.8.8 Coil Register Addressing

In Modbus, all data are organised in coils and holding registers. Coils hold a single bit, whereas holding registers hold a 2
byte word (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
1–16
17–32
33–48
49–64
7 7
65
66-65536
Table 7.12 Coils and Holding Registers
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
Table 7.13 Frequency Converter Control Word (FC Profile)
174
®
VLT
Description
Frequency converter control word (see Table 7.14)
Frequency converter speed or set-point reference Range 0x0–0xFFFF (-200% ...
~200%)
Frequency converter status word (see Table 7.14)
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
MG20Z102 - VLT
AQUA Drive FC 202 Design Guide
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 7.14 Frequency Converter Status Word (FC Profile)
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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