Data type definitions
55
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
Bild 3-10 Byte “Identification” in the data type message block
Example A single-point indication is set in DIGSI with:
Byte offset = 5
Bit mask = 08 (hex) → corresponds to 00001000
bin
(bit position 3)
The identification byte in the message block for this single-point indication has the
value
00101011
bin
= 2B
hex
.
Byte 2: Value 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.
Bild 3-11 Byte “Value” in the data type message block
Value (bits 0 and 1)
• Single-point indication
00
bin
= OFF, 01
bin
= ON
• Double-point indication
00
bin
= Intermediate position, 01
bin
= OFF,
10
bin
= ON, 11
bin
= Intermediate position
Note:
Only information (single-point/double-point indications) located in the first 32 bytes of
the PROFIBUS-DP telegram can be identified.
Identification byte
Bit position
Byte offset
01234567
Bit in the identification byte
Meaning
Value byte
Value
Indication type
01234567
Bit in the value byte
Meaning
reserved = 0
reserved = 0
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