Message Translation Examples - Danfoss VLT 5000 Instruction Manual

Message EXAMPLE 1: Start Motor, Run Speed 40%
Translation
Examples
Modbus function 0F
Message sent to Modbus RTU option car Message sent to Modbus R Message sent to Modbus R
Message sent to Modbus R Message sent to Modbus R
Force Data
Coils (8-15)
Modbus message string:
[01] [0F] [00] [00] [00] [20] [04] [7C] [04] [99] [19] [37] [43]
Modbus message string:
[01] [0F] [00] [00] [00] [20] [04] [7C] [04] [99] [19] [37] [43]
Message r Message r
Message retur Message r Message r
MG.10.P2.22 - VLT is a registered Danfoss trademark
(Force Multiple Coils).
HEX
Byte 0 Byte 1 Byte 2
Slave Function Coil Addr HI
Address
01 0F
Byte 8 Byte 9 Byte 10
Force Data HI Force Data
LO Coils (16-23)
Coils (24-31)
04 99
Start Command: 0000010001111100 = 047C
(see FC Protocol Control Word Bit Descriptions)
NOTE: Speed Command: 4000
40% of 4000 = 1999
HEX
etur etur ned to Modbus master fr ned to Modbus master fr
etur eturned to Modbus master fr ned to Modbus master fr ned to Modbus master from Modbus R
Byte 0 Byte 1
Slave Function
Address
01 0F
All values are in hexadecimal.
TU option car TU option car TU option card fr d fr d from Modbus master d fr om Modbus master om Modbus master om Modbus master
TU option car d fr om Modbus master
Byte 3 Byte 4
Coil Addr LO # of Coils HI
00 00 00
Byte 11
Error Check
LO
19 [37] [43]
= 100% speed
HEX
(reversed)
HEX
om Modbus R om Modbus R
om Modbus R om Modbus RTU option car
Byte 2 Byte 3
Coil Addr HI Coil Addr LO
00 00
Byte 5 Byte 6
# of Coils LO Byte Count
20 04
(reversed)
HEX
TU option car TU option card d d d d TU option car
TU option car
Byte 4 Byte 5
No. of Coils No. of Coils
HI LO
00 20
Byte 7
Force Data HI
Coils (0-7)
7C
Byte 6
Error Check
[54] [13]
19