Rack Or Station Failure Ob; Time Of Day Ob - Siemens S7-1200 System Manual

PLC concepts
4.1 Execution of the user program
Table 4- 7
Input
LADDR
Event_Class
Fault_ID
4.1.3.9

Rack or station failure OB

The "Rack or station failure" OB executes when the CPU detects the failure or
communication loss of a distributed rack or station.
Rack or station failure event
The CPU generates a rack or station failure event when it detects one of the following:
● The failure of a DP master system or of a PROFINET IO system (in the case of either an
incoming or an outgoing event).
● The failure of a DP slave or of an IO device (in the case of either an incoming or an
outgoing event)
● Failure of some of the submodules of a PROFINET I-device
If you have not programmed this OB, the CPU changes to STOP mode when any of these
conditions occur.
Table 4- 8
Input
LADDR
Event_Class
Fault_ID
4.1.3.10

Time of day OB

Time of day OBs execute based on configured clock time conditions. The CPU supports two
time of day OBs.
92
Start information for pull or plug of modules OB
Data type Description
HW_IO Hardware identifier
Byte 16#38: module inserted
16#29: module removed
Byte Fault identifier
Start information for rack or station failure OB
Data type Description
HW_IO Hardware identifier
Byte 16#32: Activation of a DP slave or an IO device
16#33: Deactivation of a DP slave or an IO device
16#38: outgoing event
16#39: incoming event
Byte Fault identifier
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG