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Parameterisation
Byte
Numb
Designation
no.
er of
bytes
5
2
Number of bytes to
follow
6
1
Device identification
Tab. 14: Structure of Modbus TCP Header
Structure of Modbus TCP addressing function code 0x17
7
8
Fig. 7: Structure of Modbus TCP addressing
7 Function code
8 Start address of the read registers
10 Number of registers read
Byte no.
Numb
er of
trans
receiv
bytes
mit
e
7
7
1
8
-
2
9
-
10
-
2
11
-
12
-
2
13
-
14
-
2
Festo — VAEM-V-S8EPRS2 — 2021-10a
Description
Number of bytes of device
identifier, function code,
addressing and data area
Freely selectable, unique
address, Slave-ID
00 (default)
10
Designation
Function code
Start address of the
read registers
Number of registers
read
Start address of the
write registers
Number of registers
written
12
12 Start address of the write registers
14 Number of registers written
16 Number of bytes written
Description
0x17 (VAEM standard)
Reading and writing of data
0x0000 (default value)
0x0007 (default value)
0x0000 (default value)
0x0007 (default value)
Byte order
least significant byte
14
Byte order
most significant byte
least significant byte
most significant byte
least significant byte
most significant byte
least significant byte
most significant byte
16
15
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