Status Ids Of Data Points - Siemens S7-1200 TELECONTROL Operating Instructions Manual

Configuration and operation
4.9 STEP 7 configuration
Block of data (ARRAY)
With the ARRAY data type, contiguous memory areas up to a size of 64 bytes can be
transferred. The following S7 data types are compatible components of ARRAY:
● Byte, USInt (total of up to 64 per data block)
● Int, UInt, Word (total of up to 32 per data block)
● DInt, UDInt, DWord (total of up to 16 per data block)
If the array is modified later, the data point must be recreated.
Time stamp in UTC format
Time stamps are transferred in UTC format (48 bits) and contain the time difference in
milliseconds since 01.01.1970.
4.9.7.3

Status IDs of data points

Status IDs of data points
Along with the value of a data point, status identifiers of the data point are transferred in
every frame. They can be evaluated by the communications partner.
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)
68
6 5
SB LOCAL_
FORCED
(Bit is not
Substitute
set.)
value
(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
Operating Instructions, 10/2016, C79000-G8976-C311-02
2 1
RESTART ONLINE
Value not Value is
updated valid, CPU
after start in RUN
1 1
CP 1242-7 GPRS V2
0
1