Danfoss VLT Flow Drive FC 111, Design Manual, Page: 116 / 148

Bus ad-
dress Bus
regis-
ter
(1)
PLC reg-
ister Content Access Description
3 4 40004 Free – –
4 5 40005 Free – –
5 6 40006 Modbus configu-
ration Read/Write TCP only. Reserved for Modbus TCP ( parameter 12-28
Store Data Values and parameter 12-29 Store Always -
stored in, for example, EEPROM).
6 7 40007 Last fault code Read only Fault code received from parameter database, refer to
WHAT 38295 for details.
7 8 40008 Last error register Read only Address of register with which last error occurred, refer
to WHAT 38296 for details.
8 9 40009 Index pointer Read/Write Subindex of parameter to be accessed. Refer to WHAT
38297 for details.
9 10 40010 Parameter 0-01
Language Dependent on
parameter ac-
cess Parameter 0-01 Language (Modbus register = 10 param-
eter number) 20 bytes space reserved for parameter in
Modbus map.
19 20 40020
Free – –
29 30 40030
Parameter 0-03
Regional Settings
Dependent on
parameter ac-
cess
Parameter 0-03 Regional Settings 20 bytes space re-
served for parameter in Modbus map.
1
Value written in the Modbus RTU telegram must be 1 or less than the register number. For example, Read Modbus Register 1 by writing value 0 in
the telegram.
8.8.9 Access via PCD Write/read
The advantage of using the PCD write/read configuration is that the controller can write or read more data in 1 telegram. Up to 63
registers can be read or written to via the function code read holding register or write multiple registers in 1 telegram. The structure
is also flexible so that only 2 registers can be written to and 10 registers can be read from the controller.
The PCD write list is data sent from the controller to the drive, the data includes control word, reference, and application dependent
data like minimum reference and ramp times, and so on.
N O T I C E
The control word and reference is always sent in the list from the controller to the drive.
The PCD write list is set up in parameter 8-42 PCD Write Configuration .
The PCD read list is data sent from the drive to the controller like status word, main actual value, and application dependent data
like running hours, motor current, and alarm word.
N O T I C E
The status word and main actual value is always sent in the list from the drive to the controller.
AJ363928382091en-000101 / 130R0983 116 | Danfoss A/S © 2021.04
RS485 Installation and Set-up
VLT® Flow Drive FC 111
Design Guide