Data Point Index - Siemens CP 1243-7 LTE Operating Instructions Manual

Configuration
4.12 Data point configuration
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.
4.12.6

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.).
● Output
– A data point of the type output can have the same index as a data point of the type
– Several data points of the type output can have the same index.
Note
Data points for the inter-station communication with a CP in another S7 station
Note that for inter-station communication, the indexes of the two corresponding data points
(data point pair) must be identical for the sending and receiving CP, see also section Partner
stations: Configuring the inter-station communication (Page 99).
88
6 5
SB LOCAL_
FORCED
(Bit is not
Substitute
set.)
value
1 1
input.
4 3
CARRY
Counted
value over-
flow before
reading the
value
(irrelevant)
1
Operating Instructions, 04/2017, C79000-G8976-C381-03
2 1
OVER_ RESTART
RANGE
Limit value Value not
of the ana- updated
log value after start
prepro-
cessing
overshot /
undershot
1 1
0
ONLINE
Value is
valid, CPU
in RUN
1
CP 1243-7 LTE