20
MG.10.P2.22
VLT is a registered Danfoss trade mark
Message
Translation
Examples
EXAMPLE ONE: Start Motor, Run Speed 40%
All values are in hexadecimal.
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Slave
Addres
Function
Coil Addr HI
Coil Addr LO
# of Coils HI
# of Coils LO
Byte Count
Force Data HI
Coils (0-7)
01 0F 00 00 00 20 04 7C
Byte 8
Byte 9
Byte 10
Byte 11
Force Data
LO
Coils (8-15)
Force Data HI
Coils (1 -23)
Force Data
LO
Coils (2 -31)
Error Check
04
99
19
[37]
[43]
Message r
Message r
Message r
Message r
Message retur
etur
etur
etur
eturned to Modbus master fr
ned to Modbus master fr
ned to Modbus master fr
ned to Modbus master fr
ned to Modbus master from Modbus R
om Modbus R
om Modbus R
om Modbus R
om Modbus RTU option car
TU option car
TU option car
TU option car
TU option card
d
d
d
d
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Slave
Address
Function
Coil Addr HI
Coil Addr LO
No. of Coils
HI
No. of Coils
LO
Error Check
01 0F 00 00 00 20
[54]
[13]
Modbus function 0F
HEX
(
Force Multiple Coils
).
Message sent to Modbus RTU option card from Modbus master
Message sent to Modbus RTU option card from Modbus master
Message sent to Modbus RTU option card from Modbus master
Message sent to Modbus RTU option card from Modbus master
Message sent to Modbus RTU option card from Modbus master
Drive Start Command, with bytes reversed (see FC Protocol Control Word Bit Descriptions):
binary (bit 15 through bit 00) 0000010001111100 = 047C
Modbus message string:
[01] [0F] [00] [00] [00] [20] [04] [7C] [04] [99] [19] [37] [43]
{
Start Command: 0000010001111100 = 047C
HEX
(reversed)
(see
FC Protocol Control Word Bit Descriptions
)
Modbus message string:
[01] [0F] [00] [00] [00] [20] [04] [7C] [04] [99] [19] [37] [43]
{
NOTE: Speed Command: 4000
HEX
= 100% speed
40% of 4000
HEX
= 1999
HEX
(reversed)
