Siemens LMV3 series User Manual

LMV Series Technical Instructions
Document No. LV3-1000
SCC Inc. Page 5 Section 7
Modbus functions
The following Modbus functions are supported:
Function number
Function
0x
03 /
0x
04
Reading n words
0x
06
Writing one
word
0x
1
0
Writing n words
Requirements for the Modbus master
A Modbus system whose connection is based on RS485 is a robust system.
With regards to the possible cable lengths and the loads produced by the various users and
environmental conditions, the master software should satisfy the following criteria:
• In the case of write processes, correct writing must be checked through back-reading
• In the case of read processes, it must be checked whether a reply from the slave is received. If
there is no such reply, the inquiry must be repeated, or it must be checked whether an error
occurred (wiring, valid Modbus address, etc.)
Modbus addresses
Overview table
Function
Address
dec/hex
Number
of words
Data designation
Access
Data
format
Data type /
coding
Range
03/04
0
/0h
1
Burner control p
hase
R
U16
0...255
03/04
1
/1h
1
Pos
ition of current
fuel actuator
R
S16
Degrees
-
50... 150
°
03/04
4
/4h
1
Position
of air actuator
R
S16
Degrees
-
50... 150
°
03/04
8
/8h
1
Manipulated variable
VSD
R
S16
Percent
0…1
0
0 %
03/04
9
/9h
1
Current type of fuel
(default setting: 0)
R
U16
0= fuel 0
1= fuel 1
0...1
03/04
10
/Ah
1
Current output
R
U16
Fire rate
Modulating:
0…100%
Multistage:
1001…1003
Invalid:
32767
03/04
13
/Dh
1
Flame signal
R
U16
Percent
0…100 %
03/04
14
/0Eh
1
Current fuel throughput
R
U16
0..65535
0…6553.4
m
3
/h, L/h,
ft
3
/h, g/h
Error:
65535.5
03/04
21
/15h
2
Startup counter total
R
S32
0…999999
03/04
25
/19h
1
Current error: Error code
R
U16
0...
255
03/04
26
/1Ah
1
Current error: Diagnostic code
R
U16
0…
255
03/04
27
/1Bh
1
Current error: Error class
R
U16
0...6
03/04
28
/1Ch
1
Current error: Error phase
R
U16
0...255

Siemens LMV3 series Specifications

General

Brand	Siemens
Model	LMV3 series
Category	Control Unit
Language	English