Coil Register Addressing - Danfoss VLT Micro Drive FC 51 Design Manual

RS485 Installation and Set-...

8.8.8 Coil Register Addressing

In Modbus, all data is organized in coils and holding
registers. Coils hold a single bit, whereas holding registers
hold a 2 byte word (that is 16 bits). All data addresses in
Modbus telegrams are referenced to 0. The first occurrence
of a data item is addressed as item number 0. 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 telegram. 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 telegram. 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
8 8
(see Table 8.16).
17–32 Frequency converter speed or
setpoint reference range 0x0–
0xFFFF (-200% ... ~200%).
33–48 Frequency converter status word
(see Table 8.17).
49–64 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
65
converter.
1 = Parameter changes are written
to the RAM and EEPROM of the
frequency converter.
66–65536 Reserved.
Table 8.15 Coil Register
74
®
VLT Micro Drive FC 51
Coil
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
Signal
direction
Table 8.16 Frequency Converter Control Word (FC Profile)
Master to slave
Coil
Master to slave 33
34
Slave to master
35
36
37
38
Slave to master
39
40
41
42
43
44
Master to slave
45
46
47
48
–
Table 8.17 Frequency Converter Status Word (FC Profile)
Danfoss A/S © 01/2016 All rights reserved.
0 1
Preset reference lsb
Preset reference msb
DC brake No DC brake
Coast stop No coast stop
Quick stop No quick stop
Freeze frequency No freeze frequency
Ramp stop Start
No reset Reset
No jog Jog
Ramp 1 Ramp 2
Data not valid Data valid
Relay 1 off Relay 1 on
Relay 2 off Relay 2 on
Set up lsb
–
No reversing Reversing
0 1
Control not ready Control ready
Frequency converter not Frequency converter ready
ready
Coast stop Safety closed
No alarm Alarm
Not used Not used
Not used Not used
Not used Not used
No warning Warning
Not at reference At reference
Hand mode Auto mode
Out of frequency range In frequency range
Stopped Running
Not used Not used
No voltage warning Voltage warning
Not in current limit Current limit
No thermal warning Thermal warning
MG02K402