Safe Programable Logic (Spl) (840D Sw 4.4.18) - Siemens SINUMERIK 840D Description Of Functions

3 Safety-Related Functions

3.10 Safe programable logic (SPL) (840D SW 4.4.18)

3.10 Safe programable logic (SPL) (840D SW 4.4.18)
Function Until now, safety-relevant signals were processed in external logic.
SPL, which comprises NCK-SPL and PLC-SPL greatly reduces the amount of
external wiring required. The logic used up until now has been replaced by a
written program (SPL).
Features:
•
•
•
In order to check that the two SPLs (PLC and NCK) are functioning, a cyclic
data comparison between the PLC and NCK is organized by the system
program. Monitoring is performed both by the NCK-CPU and the PLC-CPU
independently. This involves a crosswise data comparison of the signals that
are input into the SPL and the safety-relevant signals generated by the SPL as
well as internal states (markers).
Fig. 3-32
Logic operations up to Drive monitoring channel:
The SGEs/SGAs can be logically combined in different ways as defined in the
and including
SW 4.4.12 PLC user program and the result output at the interface or PLC I/Os.
NCK monitoring channel:
The SGEs/SGAs are assigned via input and output assignments that can be
parameterized via machine data.
The input signals can be processed by multiple distribution (1 input is assigned
to several axes) and the output signals by multiple assignment (signals of
several axes are assigned to 1 output).
Multiple distribution/assignment can also be parameterized via machine data.
Signals in this channel cannot be subject to other logic operations.
3-136
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
Logic operations implemented by the user are cyclically processed
Instructions are effective in all operating modes
The instructions immediately start after the control system runs-up
SGEs
Direct connection of max. 64
safety-related sensors
(e.g.: mode switch, light barrier,
EMERGENCY OFF, ...)
SGEs
Safe programmable logic
NCK SGAs
combinational
logic
Connection of max. 64
safety-related actuators
Event and data
cross-checking
(e.g.: protective door locking,
motor brakes, ...)
PLC
combinational
logic
SGAs
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11.03
SPL_12.dsf