Danfoss VLT 2800 Series Operating Instructions Manual page 28

Field Name
Slave Address
Function
Force Data HI
Force Data LO
Quantity of Coils HI
Quantity of Coils LO
Error Check (CRC)
å Force Multiple Coils (0F
Description
Forces each coil (0X reference) in a sequence of coils 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 references
to be forced. Coils are addressed starting at
zero. Coil 1 is addressed as 0.
See example 1 Start Motor, Run Speed 40 %.
Field Name
Slave Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Byt Count
Force Data HI (Coils
8-1)
Force Data LO (Coils
10-9)
Error Check (CRC)
Response
The normal response returns the slave address, function
code, starting address, and quantity of coils forced.
28
VLT® Serie 2800 and VLT® Serie 6000 Modbus RTU
Example (HEX)
01
05
FF
00
00
0A
-
)
HEX
Example (HEX)
01
0F
00
00
00
0A
02
FF
03
-
Field Name
Slave Address
Function
Coil Address HI
Coil Address LO
Quantity of Coils HI
Quantity of Coils LO
Error Check (CRC)
å Read Holding Registers (03
Description
Reads the binary contents of holding registers
(4x references) in the slave. Broadcast is
never supported for reads.
Query
The query message specifies the starting register and
quantity of registers to be read. Registers are addressed
starting at zero. Registers 1-4 are addressed as 0-3.
See example 4 Write Parameter 104, Motor Frequency.
Field Name
Slave Address
Function
Starting Address HI
Starting Address LO
No. of Points HI
No. of Points LO
Error Check (CRC)
Response
The register data in the response message are
packed as two bytes per register, with the binary
contents right justified within each byte. For each
register, the first byte contains the high order bits
and second contains the low order bits.
MG.10.S1.22 - VLT is a registered Danfoss trademark
Example (HEX)
01
0F
00
00
00
0A
-
)
HEX
Example (HEX)
01
03
00
00
00
03
-