Festo VAEM-V-S8EPRS2 Operating Instructions Manual page 16

Parameterisation
Byte no. Num-
ber of
trans- recei-
bytes
mit ve
14 - 2
15 -
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 Read/write function
18 Data type
19 System parameters index
Fig. 8 Function and data area function code 0x17
Send Rece- Num-
Byte ive ber 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 writ-
ten
Designation
Read or write access
Data type
Index
Subindex
Description
0x0007 (default value)
0x0E (default value)
21 Addressing parameter subindex
22 Error (reserved)
23 Data area
Description
0x00: read access
0x01: write access
Data type dependent on sys-
tem parameter index
Tab. 10 Data types
è
Function to be executed
Tab. 11 Parameter listing
è
index with abbreviations
Tab. 31 Valve control
è
functions
Addressing of the function at
system or valve
level Tab. 12 Listing of
è
subindex and addressing
Festo — VAEM-V-S8EPRS2 — 2020-07
Byte order
most significant byte
least significant byte
Byte order
Highest-value byte
Lowest-value byte