Lenze i55 Series User Manual

9.5.7 Funcon codes
The mode of access to inverter data (parameters) is controlled via funcon codes.
Details
The inverter supports the following funcon codes:
Funcon code Funcon name Descripon
3 0x03 Read Holding Registers Read one or more 16-bit data words.
6 0x06 Preset Single Register Write a 16-bit data word.
16 0x10 Preset Mulple Registers Write one or more 16-bit data words.
23 0x17 Read/Write 4X Registers Within a transacon
•
write into a group of connected 4X holding registers.
•
read from a group of connected 4X holding registers.
Addressing
•
The funcon codes listed above exclusively refer to 4X registers in Modbus addressing.
•
All data in the inverter can only be accessed via 4X registers, i.e. via register addresses
from 40001.
•
The 4xxxx reference is implicit, i. e. given by the funcon code used. In the frame therefore
the leading 4 is omied in the addressing process.
•
Lenze supports the basic 1 addressing of Modbus, i.e. the numbering of the registers starts
with 1 whereas addressing starts with 0. For example, the address 0 is used in the frame
when register 40001 is read.
Frame structure
Communicaon is established on the basis of the central medium access method. Communi-
caon is always started by a master request. The inverter (slave) then either gives a valid
response or outputs an error code (provided that the request has been received and evalu-
ated as a valid Modbus frame). Error causes can be invalid CRC checksums, funcon codes
that are not supported, or impermissible data access.
All Modbus frames have the following basic structure:
•
A "frame" consists of a PDU (Protocol Data Unit) and an ADU (Applicaon Data Unit).
•
The PDU contains the funcon code and the data belonging to the funcon code.
•
The ADU serves the purposes of addressing and error detecon.
•
The data are represented in Big Endian format (most signicant byte rst).
ADU (Applicaon Data Unit)
Slave address Funcon code Data Checksum (CRC)
PDU (Protocol Data Unit)
Conguring the network
Modbus RTU
Funcon codes
287

Lenze i55 Series Specifications

General

Brand	Lenze
Model	i55 Series
Category	Inverter
Language	English