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Parameterisation
Byte
Num-
Designation
no.
ber of
bytes
2
2
Protocol identifier
3
4
2
Number of bytes to
follow
5
6
1
Device identification
Tab. 14 Structure of Modbus TCP Header
Structure of Modbus TCP addressing function code 0x17
7 Function code
8 Start address of the read registers
10 Number of registers read
Fig. 7 Structure of Modbus TCP addressing
Byte no.
Num-
ber of
trans-
recei-
bytes
mit
ve
7
7
1
8
-
2
9
-
10
-
2
11
-
12
-
2
13
-
Festo — VAEM-V-S8EPRS2 — 2020-07
Description
0x0000 (default)
Number of bytes of device
identifier, function code,
addressing and data area
Freely selectable, unique
address, Slave-ID
00 (default)
Designation
Function code
Start address of the
read registers
Number of registers
read
Start address of the
write registers
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)
Byte order
most significant byte
least significant byte
most significant byte
least significant byte
Byte order
most significant byte
least significant byte
most significant byte
least significant byte
most significant byte
least significant byte
15
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