Siemens Sinumerik 840D sl Function Manual page 322

Connecting Sensors/Actuators
7.5 Safe programmable logic (SPL)
STOP_MODE:
For crosswise comparison error:
0 = external STOP D
1 = external STOP E
to the drive
Data area/status
SPL_DATA
The useful (net) data for the PLC--SPL is contained in the SPL_DATA structure.
The useful data area is sub--divided into internal inputs/outputs and marker areas
and external inputs/outputs that correspond to the hardware I/Os.
With the appropriate parameterization for external inputs/outputs, the basic pro-
gram transfers the input image of the I/Os to the external inputs in DB 18 and from
the external outputs in DB 18 to the output.
SPL_DELTA
The SPL_DELTA area is used for diagnostics. A signal with the status TRUE in this
area means that the signal is different in the NCK and PLC at this bit position.
CMDSI
Signal CMDSI can be used to extend the timeout value in the crosswise SPL data
comparison by a factor of 10. This extension is used for long forced checking pro-
cedure pulses or single--channel test stop logic functions.
STATSI
A value not equal to 0 means that an error has occurred in the crosswise data
comparison.
LEVELSI
The signal LEVELSI is used for diagnostics and indicates how many signals with
different signal levels are present.
COMM_TO
If communication between NCK and PLC regarding the SPL--CDC is interrupted,
then the PLC is switched into the STOP state with a delay of 5 s. Status signal
DB18.DBB119, bit 5 is used to inform the SPL programmer that the 5 s timer was
started. This means that it is possible to initiate system--specific actions before the
PLC goes into the stop condition.
SPL status signals for SPL_STATUS (DB18.DBB136)
For a detailed description, see Chapter 8.6.3 "PLC data bock (DB 18)".
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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