Danfoss VLT Flow Drive FC 111 - 8.8.10 How to Control the Drive; 8.8.10.1 Introduction; 8.8.10.2 Function Codes Supported by Modbus RTU

CTW
Holding
Register
2810
Write
Master Drive
Read
Drive Master
Controlled by
Parameter
Holding
Register
Controlled by
Parameter
8-42 [0]
REF
2811
8-42 [1]
2812
8-42 [2]
PCD 2
write
2813
8-42 [3]
PCD 3
write
2814
8-42 [4]
PCD 4
write
2815
8-42 [5]
PCD 5
write
...
...
...
write
2873
8-42 [63]
PCD 63
write
STW
2910
8-43 [0]
MAV
2911
8-43 [1]
2912
8-43 [2]
PCD 2
read
2913
8-43 [3]
PCD 3
read
2914
8-43 [4]
PCD 4
read
2915
8-43 [5]
PCD 5
read
...
...
...
read
2919
8-43 [63]
PCD 63
read
e30bc048.10
Illustration 77: Accessing via PCD write/read
N O T I C E
The boxes marked in gray are not changeable, they are default values.
N O T I C E
The 32-bit parameters must be mapped inside the 32-bit boundaries (PCD2 & PCD3 or PCD4 & PCD5, and so on), where the pa-
rameter number is mapped twice to parameter 8-42 PCD Write Configuration or parameter 8-43 PCD Read Configuration.
8.8.10 How to Control the Drive
8.8.10.1 Introduction
This section describes codes which can be used in the function and data fields of a Modbus RTU telegram.
8.8.10.2 Function Codes Supported by Modbus RTU
Modbus RTU supports use of the following function codes in the function field of a telegram:
Table 67: Function Codes
Function
Function code (hex)
Read coils
1
Read holding registers
3
Write single coil
5
Write single register
6
Write multiple coils
F
Write multiple registers
10
Get comm. event counter
B
Report follower ID
11
Read write multiple registers
17
AJ363928382091en-000101 / 130R0983 | 117Danfoss A/S © 2021.04
RS485 Installation and Set-up
VLT® Flow Drive FC 111
Design Guide