Mapping The Holding Registers To Drive Parameters - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS485 Installation and Set-...
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.
3 3
The PCD write list is data sent from the controller to the
frequency converter such as:
•
Control word.
•
Reference.
•
Application dependent data like minimum
reference and ramp times.
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.
The PCD read list is data sent from the frequency converter
to the controller such as:
•
Status word.
•
Main actual value.
•
Application-dependent data like running hours,
motor current, and alarm word.
NOTICE
The status word and main actual value are always sent in
the list from the frequency converter to the controller.
Write
Master
Holding
Register
2810
CTW
2811
REF
PCD 2
2812
write
PCD 3
2813
write
PCD 4
2814
write
PCD 5
2815
write
...
...
write
PCD 63
2873
write
Illustration 3.15 PCD Write/Read Lists
26
Read
Frequency
Frequency Converter
Converter
Controlled by Holding
Parameter Register
8-42 [0] 2910
STW
8-42 [1] 2911
MAV
PCD 2
8-42 [2] 2912
read
PCD 3
8-42 [3] 2913
read
PCD 4
8-42 [4]
2914
read
PCD 5
8-42 [5]
2915
read
...
...
...
read
PCD 63
8-42 [63]
2919
read
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®
VLT DriveMotor FCP 106/FCM 106
NOTICE
The boxes marked in gray are not changeable, they are
the default values.
NOTICE
Map 32-bit parameters inside the 32-bit boundaries,
PCD2 & PCD3 or PCD4 & PCD5, and so on, where the
parameter number is mapped twice to
parameter 8-42 PCD Write Configuration or
parameter 8-43 PCD Read Configuration.
3.8.10 Mapping the Holding Registers to
Example:
The PLC sends control word, reference, set the analog
output 42 and set the torque limit.
CTW = Parameter 16-85,
Analog output = Parameter 6-52,
Illustration 3.16 PLC Sending Data
Example:
The frequency converter sends status word, main actual
value, actual motor current, digital inputs, and torque
[Nm].
Master
Register 2910
Controlled by
Parameter
Read
8-43 [0]
STW = Parameter 16-03,
Motor Current = Parameter 16-14,
8-43 [1]
Actual Torque [Nm]
Illustration 3.17 Frequency Converter Sending Data
8-43 [2]
8-43 [3]
Example, continued
8-43 [4] Map the input and output data of the Modbus RTU to the
parameter of the frequency converter. Use
8-43 [5]
parameter 8-42 PCD Write Configuration and
parameter 8-43 PCD Read Configuration for the mapping.
...
8-43 [63]
Drive Parameters
Frequency Converter
Register 2810 2811 2812
Analog
Write
CTW REF
output 42
REF = Parameter 16-86,
Torque limit Motor mode = 4-16
Frequency Converter Master
2913
2911 2912
Motor Digital
STW MAV
current inputs
MAV = Parameter 16-05,
Digital Inputs = Parameter 16-60
Drive
2813
Torque
limit
2914
Actual
Torque [Nm]
MG03N202