3 Safety-Related Functions 11.03
3.10 Safe programable logic (SPL) (840D SW 4.4.18)
© Siemens AG 2003 All Rights Reserved
3-156 SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3.10.9 SPL data on the PLC side
The safe programmable logic of the PLC (PLC-SPL) is a sub-function of the
safety functions integrated in the SINUMERIK.
The signals of the PLC-SPL are located in DB18 and are sub-divided into
1. Parameterization part and
2. Data area/status.
The link to the I/Os (external inputs/outputs) is implemented by
parameterization data INSEP_ADDR[1...8] and OUTSEP_ADDr[1...8] in
combination with the activation bits INSEP_VALID[1...8] and
OUTSEP_VALID[1...8].
The data area INSEP[1...64]/OUTSEP[1...64] is assigned to the input/output
image using this parameterization data.
The data areas are assigned byte-by-byte (byte-serial) and in any order.
INSEP_VALID / OUTSEP_VALID = TRUE:
When activation bits INSEP_VALID[1...8] and OUTSEP_VALID[1...8] are set to
TRUE the parameterized inputs/outputs are transferred to the relevant data
area INSEP / OUTSEP by the basic program.
INSEP_VALID / OUTSEP_VALID = FALSE:
If an activation signal is FALSE, there is no transfer in the associated
INSEP/OUTSEP data byte. In this case, the supply of this data byte can be
organized by the user program.
SPL_READY:
The SPL_READY = TRUE signal indicates that the commissioning phase has
been completed, i.e. if a crosswise data comparison error has occurred, the
basic program sends a "STOP D/E" to all the axes.
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 appropriate parameterization and external inputs/outputs, the basic
program 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 peripheral 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 procedure pulses or single-channel test stop logic functions.
STATSI:
A crosswise data comparison error is indicated in STATSI. STATSI contains the
number of the signal whose difference caused this error. The error number (1–
320) refers to SPL_DATA as an array with 5x64=320 signals.
Signals
Parameterization part
Data area/status
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