Danfoss VLT 6102 User Manual

VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
Supported Modbus RTU
Function Codes
å Supported Modbus RTU Function Codes
This section describes the following functions
supported by the Modbus RTU.
Read Coil Status (01
HEX
) Read Holding Registers (03
HEX
)
ForceSingleCoil(05
HEX
) Preset Single Register (06
HEX
)
Force Multiple Coils (0F
HEX
) Preset Multiple Registers (10
HEX
)
å Read Coil Status (01
HEX
)
Description
Reads the ON/OFF status of discrete outputs
(0X references, coils) in the slave. Broadcast
is never supported for reads.
Query
The query message specifies the starting coil and
quantity of coils to be read. Coils are addressed
starting at zero. Coils 1-16 are addressed as 0-15.
Example of a request to read coils 33-48 (Status
Word) from slave device 01.
Field Name Example (HEX)
Slave Address 01
Function 01
Starting Address HI 00
Starting Address LO 20
No. of Points HI 00
No. of Points LO 10
Error Check (CRC) -
Response
The coil status in the response message is packed as
one coil per bit of the data field. Status is indicated as:
1=ON;0=OFF.TheLSBofthefirstdatabytecontains
the coil addressed in the query. The other coils follow
toward the high order end of this byte, and from ‘low
order to high order’ in subsequent bytes. If the returned
coil quantity is not a multiple of eight, the remaining bits
in the final data byte will be padded with zeros (toward
the high order end of the byte). The Byte Count field
specifies the quantity of complete bytes of data.
Field Name Example (HEX)
Slave Address 01
Function 01
Byte Count 02
Data (Coils 40-33) 55
Data (Coils 48-41) AA
Error Check (CRC) -
å Force Single Coil (05
HEX
)
Description
Forces a single coil (0X reference) to either ON or
OFF. When broadcast, the function forces the same
coil references in all attached slaves.
Query
The query message specifies the coil reference
to be forced. Coils are addressed starting at
zero. Coil 1 is addressed as 0. Force Data = 00
00HEX (OFF) or FF 00HEX (ON).
See example 1 Start Motor, Run Speed 40%.
Field Name Example (HEX)
Slave Address 01
Function 05
Coil Address HI 00
Coil Address LO 00
Force Data HI FF
ForceDataLO 00
Error Check (CRC) -
Response
The normal response is an echo of the query, returned
after the coil state has been forced.
MG.10.S1.22 - VLT is a registered Danfoss trademark
27

Danfoss VLT 6102 Specifications

General

Brand	Danfoss
Model	VLT 6102
Category	Media Converter
Language	English