Data Point Index - Siemens SIMATIC NET TeleControl S7-1200 CP 1243-1 Operating Instructions Manual

The status bits are converted to the OPC quality code as follows by TCSB.
● Quality = BAD, if:
NON_EXISTENT or OVER_RANGE = 1
● Quality = UNCERTAIN, if:
RESTART or CARRY or SB = 1
● Quality = GOOD, if:
Bits 1, 2, 3, 5 and 6 = 0
For the meaning of the status bits, see below. The entries in the table row "Meaning" relate
to the entry in the table row "Bit status".
Table 4- 2 Bit assignment of status byte 0
Bit 7
Flag name - NON_
EXISTENT
Meaning - Data point
does not
exist or S7
address
unreachable
(always
Bit status
0)
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.
4.9.5

Data point index

Configuration of the data point index
Within a CP, the indexes of the data point classes must comply with the following rules:
● Input
The index of a data point of the type input must be unique throughout all data point types
(digital inputs, analog inputs etc.).
CP 1243-1
Operating Instructions, 12/2016, C79000-G8976-C365-02
6 5
SB LOCAL_
FORCED
(Bit is not
Substitute
value set.)
(irrelevant)
1 1
4 3
CARRY OVER_
RANGE
Counted Limit value
value over- of the ana-
flow before log value
reading the prepro-
value cessing
overshot /
undershot
1
Configuration
4.9 Data points
2 1
RESTART ONLINE
Value not Value is
updated valid, CPU
after start in RUN
1 1
0
1
73