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Example
Byte 2: Value
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
Note:
Only information (single-point/double-point indications) located in the first 32 bytes of
the PROFIBUS-DP telegram can be identified.
Identification byte
7
6
5
4
3
Byte offset
Bild 3-10
Byte "Identification" in the data type message block
A single-point indication is set in DIGSI with:
Byte offset = 5
Bit mask = 08 (hex) → corresponds to 00001000
The identification byte in the message block for this single-point indication has the
value
00101011
= 2B
bin
hex
The value byte in the message block contains the value of a single-point/double-point
indication after a change has been registered, as well as an identification as to
whether it is a single-point or double-point alarm.
Value byte
7
6
5
4
3
Bild 3-11
Byte "Value" in the data type message block
Value (bits 0 and 1)
• Single-point indication
00
= OFF, 01
= ON
bin
bin
• Double-point indication
00
= Intermediate position, 01
bin
10
= ON, 11
= Intermediate position
bin
bin
2
1
0
Bit in the identification byte
Bit position
.
2
1
0
Bit in the value byte
= OFF,
bin
Data type definitions
Meaning
(bit position 3)
bin
Meaning
55
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