Response
The normal response is an echo of the query, returned
after the register contents have been passed.
Field Name
Example (hex)
Follower Address
01
Function
06
Register Address HI
03
Register Address LO
E7
Preset Data HI
00
Preset Data LO
01
Error Check (CRC)
-
Table 8.30 Response
8.10.6 Preset Multiple Registers (10 hex)
Description
This function presets values into a sequence of holding
registers.
Query
The query message specifies the register references to be
preset. Register addresses start at zero, that is, register 1 is
addressed as 0. Example of a request to preset 2 registers
(set
1-24 Motor Current
to 738 (7.38 A)):
Field Name
Example (hex)
Follower Address
01
Function
10
Starting Address HI
04
Starting Address LO
07
No. of Registers HI
00
No. of registers LO
02
Byte Count
04
Write Data HI
(Register 4: 1049)
00
Write Data LO
(Register 4: 1049)
00
Write Data HI
(Register 4: 1050)
02
Write Data LO
(Register 4: 1050)
E2
Error Check (CRC)
-
Table 8.31 Query
Response
The normal response returns the follower address, function
code, starting address, and quantity of registers preset.
Field Name
Example (hex)
Follower Address
01
Function
10
Starting Address HI
04
Starting Address LO
19
No. of Registers HI
00
No. of registers LO
02
Error Check (CRC)
-
Table 8.32 Response
8.11 FC Drive Control Profile
8.11.1 Control Word According to FC
Profile (8-10 Protocol = FC profile)
Modbus Holding Register numbers for Input data – CTW
and REF – and Output data – STW and MAV – are defined
in
50000 Input data
Frequency converter Control Word register
(CTW)
50010 Input data
Bus Reference register (REF)
50200 Output data Frequency converter Status Word register
(STW)
50210 Output data Frequency converter Main Value register
(MAV)
Table 8.33 Modbus Holding Register Numbers for Input and Output Data
In VLT Micro Drives after the software version 2.32 the new
feature has been implemented by copying the Input/
Output data to also be available in a lower holding register
areas:
02810 Input data
Frequency converter Control Word register
(CTW)
02811 Input data
Bus Reference register (REF)
02910 Output data Frequency converter Status Word register
(STW)
02911 Output data Frequency converter Main Value register
(MAV)
Table 8.34 Lower Register Numbers for Input and Output Data
RS-485 Installation and Set...
VLT
®
Micro Drive FC 51 Design Guide
MG02K302 - Rev. 2013-12-03
79
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