Siemens SINUMERIK 840Di sl Commissioning Manual page 488

NC Commissioning with HMI Advanced
11.11 NC/PLC Diagnosis
● PLC STOP
● PLC Delete Program
● PLC default data
● Status displays
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With the "PLC RUN" button, the PLC is put in the "RUN" state. Only read accesses are
possible via a programming device (PG) in this mode. It is not possible to make changes
to the PLC user program until the password has been set.
With the "PLC STOP" button, the PLC is put in the STOP state. Processing of the PLC
user program has stopped and all outputs are set to substitute values.
The PLC is put in the STOP state with "PLC Delete Program" button and then PLC
general reset (default data) is performed. The following actions are performed by the PLC:
– The PLC disconnects all links.
– The user data are deleted (data and program blocks)
– The system data blocks (SDB) are deleted.
– Battery-backed data are copied back into the RAM area from the PLC after general
reset.
– The diagnostics buffer, the MPI parameters, the clock time, and the operating hours
counter are not reset.
The PLC is put in the STOP state via the "PLC Default Data" button and then an
extended PLC general reset is performed. The actions stated above under Points 1 to 4
are executed and the parameters mentioned in Point 5 are additionally reset.
The status displays, which are made to look like LEDs, indicate the following:
– SF (System Fault)
Lights up in case of PLC system errors such as e.g. hardware, programming,
parameterizing, computing, time, battery, and communication errors.
– BATL (Battery Low)
Lights up if the 5 V supply voltage (buffer battery) falls below its permissible value.
– BATF (Battery Fault)
Lights up if the 5 V supply voltage (buffer battery) fails.
– FORCE
Lights up if the FORCE function is active.
The FORCE function sets user variables to permanent values that cannot be
overwritten by the user program. For detailed information on this, see the Online Help
of the SIMATIC Manager STEP 7.
– RUN: See the following table.
– STOP: See the following table.
– BUS 1
lights up in case of a bus/interface error on PROFIBUS (1) (interface X101)
– BUS 2
Lights up in case of a bus/interface error on MPI or PROFIBUS (2) (depends on
configuration of interface X102)
Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Manual