Status Ids Of Data Points; Connection Establishment - Siemens S7-1200 Operating Instructions Manual

Configuration and operation

4.9 Status IDs of data points

4.9 Status IDs of data points
Status IDs of data points
The status identifiers of the data points listed in the following tables are transferred along
with the value in each frame to the communications partner. They can be evaluated by the
communications partner.
The status identifiers are transferred in 2 bytes. Byte 1 is not used.
The meaning relates to the bit status in the last row of each table.
Table 4- 2 Byte assignment of the status byte for data points
Bit 7
Flag name -
Meaning -
(always 0)
Bit status
4.10

Connection establishment

Connection establishment
● Connection to the telecontrol server
The connection to the telecontrol server is always established by the CP.
If a connection established by the CP is interrupted, the CP automatically attempts to re-
establish the connection. Note the settings for re-establishing the connection in STEP 7,
refer to the section Ethernet interface (X1) (Page 67).
Note
Connection interrupted by the mobile wireless network provider
When using mobile wireless services, remember that existing connections can be
interrupted by mobile wireless network providers for maintenance purposes.
● Connections with direct communication (Open User Communication) and S7
communication
Connections are established as soon as the corresponding program blocks are called on
the CPU.
This also applies to the situation when a different S7 station sends data. In this case, the
corresponding receive blocks are called by the receiving station.
54
6 5
NON_ SB
Substituted
EXISTENT
Data point Substitute
does not value
exist or S7
address
unreacha-
ble
1 1
4 3
LOCAL_ CY
FORCED CARRY
Local oper- Counted
ator control value over-
flow before
reading the
value
1 1
Operating Instructions, 01/2015, C79000-G8976-C381-01
2 1
OVER_ RESTART
RANGE
Analog Value not
value: Val- updated
ue range after start
exceeded
1 1
0
ONLINE
Value is
invalid
1
CP 1243-7 LTE