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Parameterisation
Bit
Designation Status 0
4
15
-
...
Tab. 17 Meanings of the bits in the control word
Access
Data type
W (Write)
U 16
R (Read)
U16
Tab. 18 Architecture ASCII telegram control word
Access
Data
type
0x01
0x02
(write)
(Uint16)
0x00
0x02
(read)
(Uint16)
Tab. 19 Architecture of Modbus TCP: control word
Example of use of the check word
Situation: starting all selected valves
1. Reset control word.
–
Via ASCII telegram: WU16: I1S0V0
–
Using Modbus TCP: 0000 0000 0019 00 17 0000 0007 0000 0007 0E 01 02
0001 00 00 0000 0000 0000 0000
2. Set bit 1 of the control word.
–
Via ASCII telegram: WU16: I1S0V1
–
Using Modbus TCP: 0000 0000 0019 00 17 0000 0007 0000 0007 0E 01 02
0001 00 00 0000 0000 0000 0001
Ä Start all selected valves.
statusword
The status word is used for:
–
Reading the operating mode and readiness for operation
–
Error status and error detection
The status word is a 16-digit binary code. To interpret the status word, the returned decimal (RS232
communication) or hexadecimal (Ethernet communication) value must be converted into a binary
code.
The individual digits of the binary code represent the individual status indicators from right to left. The
individual bits are shown in the table from top to bottom.
18
Reserved, without function
Index I
Subindex S
1
0
1
0
System
Address-
paramet-
ing para-
ers index
meter
subindex
0x01
0x00
0x01
0x00
Change of status 0 à 1
Value V
x
-
Transfer
Example of data area Modbus TCP
value
xx
01 02 0001 00 00 xxxx xxxx
xxxx xxxx
0x00
00 02 0001 00 00 0000 0000
0000 0000
Festo — VAEM-V-S8EPRS2 — 2020-07
Example of an ASCII tele-
gram
WU16:I1S0Vx
RU16:I1S0
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