Read Cycle - Siemens CP 1243-1 Operating Instructions Manual

Configuration
4.10 Data points
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- 5 Bit assignment of the status byte
Bit 7
Flag name -
Meaning -
(always
Bit status
0)
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- 6 Bit assignment of the status byte
Bit 7
Flag name -
Meaning -
(always
Bit status
0)
4.10.6

Read cycle

Priority of the data points
The cyclic reading of the values of input data points from their assigned PLC tags on the
CPU can be prioritized.
Less important input data points do not need to be read in every CPU scan cycle. Important
input data points, on the other hand, can be prioritized for updating in every CPU scan cycle.
96
6 5
- - LOCAL_
FORCED
- - Local opera-
tor control
(always (always
0) 0)
6 5
- SB
substituted
- Substitute
value
(always
1
0)
4 3
DISCONTI
NUITY
Counted
value over-
flow before
reading the
value
1 1
4 3
- CY
carry
- Counted
value over-
flow before
reading the
value
(always
1
0)
Operating Instructions, 04/2017, C79000-G8976-C365-03
2 1
OVER_ RESTART
RANGE
Limit value of Value not yet
the analog updated after
prepro- start
cessing over-
shot /
undershot
1 1
2 1
OV NT
overflow not topical
Value range Value not
exceeded, updated
analog value
1 1
0
ONLINE
Value is valid
1
0
IV
invalid
Value is valid
0
CP 1243-1