Access Via Pcd Write/Read - Danfoss VLT HVAC Basic Drive FC 101 Design Manual

RS485 Installation and Set-...
Bus
address
register
0
1
2
3
4
5
6
7 7
7
8
9
19
29
Table 7.18 Address/Registers
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.

7.8.9 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
frequency converter, the data includes control word,
reference, and application dependent data like minimum
reference and ramp times, and so on.
NOTICE
The control word and reference is always sent in the list
from the controller to the frequency converter.
The PCD write list is set up in parameter 8-42 PCD Write
Configuration.
90
Bus
PLC
Content
1) register
1 40001 Reserved
2 40002 Reserved
3 40003 Reserved
4 40004 Free
5 40005 Free
6 40006 Modbus configuration
7 40007 Last fault code
8 40008 Last error register
9 40009 Index pointer
10 40010 Parameter 0-01 Language
20 40020 Free
Parameter 0-03 Regional
30 40030
Settings
Danfoss A/S © 04/2016 All rights reserved.
®
VLT HVAC Basic Drive FC 101
Access
–
–
–
–
–
Read/Write
Read only
Read only
Read/Write
Dependent on
parameter
access
–
Dependent on
parameter
access
The PCD read list is data sent from the frequency converter
to the controller like status word, main actual value, and
application dependent data like running hours, motor
current, and alarm word.
NOTICE
The status word and main actual value is always sent in
the list from the frequency converter to the controller.
Description
Reserved for legacy frequency converters VLT
®
VLT 2800.
Reserved for legacy frequency converters VLT
®
VLT 2800.
Reserved for legacy frequency converters VLT
®
VLT 2800.
–
–
TCP only. Reserved for Modbus TCP
(parameter 12-28 Store Data Values and
parameter 12-29 Store Always - stored in, for example,
EEPROM).
Fault code received from parameter database, refer to
WHAT 38295 for details.
Address of register with which last error occurred, refer
to WHAT 38296 for details.
Subindex of parameter to be accessed. Refer to WHAT
38297 for details.
Parameter 0-01 Language (Modbus register = 10
parameter number)
20 bytes space reserved for parameter in Modbus map.
–
Parameter 0-03 Regional Settings
20 bytes space reserved for parameter in Modbus map.
®
5000 and
®
5000 and
®
5000 and
MG18C702