Specifications

2 S7-1200/1500 Innovations
2.13 STOP mode in the event of errors
Programming Guideline for S7-1200/1500
V1.2, Entry ID: 81318674
25
Copyright

Siemens AG 2014 All rights reserved
Advantages
 You can rewire tags without changing internal relations. The communication
between controller, HMI and drive also remains unchanged.
 The length of the symbolic name does not have an influence on the
communication load between controller and HMI.
Properties
If you change addresses of PLC tags, you only have to reload the controller. It is
not necessary to reload the HMI devices, since internally, the system addresses
with the reference IDs (see Figure 2-17: Changing address or adding row).
Figure 2-17: Changing address or adding row
Changing address
& PLC
Adding row
& PLC
PLC Tags
DB Elements
Motor_1
Motor_1%I0.0 %I2.0
2.13 STOP mode in the event of errors
In comparison to S7-300/400 there are fewer criteria with the S7-1200/1500 that
lead to the “STOP” mode.
Due to the changed consistency check in the TIA Portal, the “STOP” mode for S7-
1200/1500 controllers can already be excluded in advance in most cases. The
consistency of program blocks is already checked when compiling in the
TIA Portal. This approach makes the S7-1200/1500 controllers more fault tolerant
to errors than their predecessors.
Advantages
There are only three fault situations that put the S7-1200/1500 controllers into the
STOP mode. This makes the programming of the error management clearer and
easier.
Properties
Table 2-12: Responses to errors of S7-1200/1500
Error S7-1200 S7-1500
1. Cycle monitoring time
exceeded once
RUN
STOP, when OB80 is
not configured
2. Cycle monitoring time
exceeded twice
STOP STOP
3. Programming errors RUN
STOP, when OB121 is
not configured