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Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
7
Examples for data exchange via Modbus/TCP
Configuration and Startup (Modbus/TCP)
7.5.2
Parameter access
FC23 is suitable for the parameter access via the MOVILINK
®
parameter channel as it
is possible to realize the request to the MOVILINK
®
service and the collection of the re-
sponse in one Modbus/TCP service.
For read purposes, the TCP/IP telegram is structured as follows.
Byte Valu
e
Meaning
Interpretation
Help
0
0x00
Transaction identifier
For a detailed description,
refer to Modbus/TCP specifi-
cation and section 'Modbus
protocol (Modbus/TCP)'
1
2
0x00
Protocol identifier
3
4
0x00
Length field
Number of bytes after byte 5:
Must be 19 for MOVILINK
®
5
0x13
6
0x00
Unit identifier
1)
1) The unit identifier 0 and 0xFF is used to access the parameters of DHR41B directly. For other values, the
request is passed on to a lower-level unit. The assignment of the unit identifier to the downstream units on
the system buses is determined via the routing table of the DHR41B control configuration. This allows pa-
rameter access for inverters that are connected via a DHR41B unit without any restrictions. See the 'Ap-
pendix' for a schematic representation of parameter access to lower-level units.
7
0x17
Function code
Service = FC23 (read + write reg-
ister)
8
0x02
Read reference number
Offset where the MOVILINK
®
parameter channel starts:
Must always be 512.
9
0x00
10
0x00
Read word count
Must always be 4 for the MOV-
ILINK
®
parameter channel.
11
0x04
12
0x02
Write reference number
Offset where the MOVILINK
®
parameter channel starts:
Must always be 512.
13
0x00
14
0x00
Write word count
Must always be 4 for the MOV-
ILINK
®
parameter channel.
15
0x04
16
0x08
Write byte count
8 bytes MOVILINK
®
17
0x31
Data:
MOVILINK
®
parameter
channel
Administration byte: 0x31 = read
Data mapping and definition,
see IEC program and SEW
unit profile
18
0x00
Parameter subindex
19
0x20
Parameter index:
0x206c = 8300 = Firmware part
number
20
0x6C
21
0x00
Parameter value Irrelevant for
read service
22
0x00
23
0x00
24
0x00
Содержание DHR41B
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