Festo VAEM-V-S8EPRS2 Operating Instructions Manual page 16

Parameterisation
Byte no. Numb
er of
trans receiv
bytes
mit e
15 - 2
16 8 1
Tab. 15: Structure of Modbus TCP addressing function code 0x17
Structure of Modbus TCP function and data area function code 0x17
17 18 19
Fig. 8: Function and data area function code 0x17
17 Read/write function
18 Data type
19 System parameters index
Send Recei Numb
Byte ve er of
no. Byte bytes
no.
17 9 1
18 10 1
19 11 2
20 12
21 13 1
16
Designation
Number of registers
written
Number of bytes
written
21 22
Designation
Read or write access
Data type
Index
Subindex
Description
0x0007 (default value)
0x0E (default value)
23
21 Addressing parameter subindex
22 Error (reserved)
23 Data area
Description
0x00: read access
0x01: write access
Data type dependent on
system parameter index
è Tab. 10 Data types
Function to be executed
è Tab. 11 Parameter listing
index with abbreviations
è Tab. 31 Valve control func-
tions
Addressing of the func-
tion at system or valve
levelè Tab. 12 Listing of sub-
index and addressing
Festo — VAEM-V-S8EPRS2 — 2021-10a
Byte order
least significant byte
Byte order
Highest-value byte
Lowest-value byte