Siemens SIMATIC S7-1200 CP 1243-8 IRC - Page 142

Configuration
4.18 Data points
CP 1243-8 IRC
142 Operating Instructions, 02/2018, C79000-G8976-C385-03
Generation of events if a data point status changes
With data points that were configured as an event, the change to the status bit of the status
identifiers described below also leads to an event being generated.
Example: If the value of the status "RESTART" of a data point configured as an event
changes form 1 (value not yet updated) to 0 (value updated) when the station starts up, this
causes an event to be generated.
Status identifiers with the DNP3 protocol
The status IDs correspond to the following elements of the specification:
OBJECT FLAGS - DNP3 Specification, Volume 6, Data Object Library - Part 1
Table 4- 7 Bit assignment of the status byte
Bit
7
6
5
4
3
2
1
0
Flag name
- - - LOCAL_
FORCED
DISCONTI
NUITY
OVER_
RANGE
RESTART ONLINE
Meaning
- - - Local opera-
tor control
Counted
value over-
flow before
reading the
value
Limit value of
the analog
prepro-
cessing over-
shot /
undershot
Value not yet
updated after
start
Value is valid
Bit status
(always
0)
(always
0)
(always
0)
1 1 1 1 1
Status identifiers with the IEC protocol
The status IDs correspond to the following elements of the specification:
Quality descriptor - IEC 60870 Part 5-101
Table 4- 8 Bit assignment of the status byte
Bit
7
6
5
4
3
2
1
0
Flag name
- - SB
substituted
- CY
carry
OV
overflow
NT
not topical
IV
invalid
Meaning
- - Substitute
value
- Counted
value over-
flow before
reading the
value
Value range
exceeded,
analog value
Value not
updated
Value is valid
Bit status
(always
0)
(always
0)
1
(always
0)
1 1 1 0