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Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
8
Protocol structure
The Modbus Protocol (Modbus/TCP)
8.2.5
Service FC43 Read device identification
The service
FC43 Read device identifications
is also referred to as MEI ('Modbus En-
capsulated Interface Transport'). It can tunnel services and method calls. The service
Read Device Identification
is tunneled with the MEI-Type 0x0E. According to the
Modbus specifications, there are 3 blocks (
Basic
,
Regular
and
Extended
) that can be
read. The DHR41B option supports the
Basic
and
Regular
blocks (conformity level 02).
The entire block is always read (streaming). This means that values 01 and 02 are per-
mitted in the
Read device ID code
. The
Object ID
must be zero. The response is not frag-
mented.
Example
Request:
Response:
Exception:
Byte
Designation
Meaning/permitted values
0 - 6
MBAP header
See chapter 'Header'.
7
Function code
Requested service: 43 (Read Device Identification)
8
MEI type
0x0E
9
Read device ID code
01 or 02
10
Object ID
0
Byte
Designation
Meaning/permitted values
0 - 6
MBAP header
See chapter 'Header'.
7
Function code
Service: 43 (Read Device Identification)
8
MEI type
0x0E
9
Read device ID code
01 or 02
10
Conformity level
02
11
More follows
0
12
Next object ID
0
13
Number of objects
e.g. 3
14
Object ID
15
Object length
16
Object value
17
....
Byte
Designation
Meaning/permitted values
0 - 6
MBAP header
See chapter 'Header'.
7
Function code
43
hex
8
Exception code
Fault code
0
0
I
Содержание DHR41B
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