Safe Programmable Logic (Spl); Fundamentals - Siemens SINUMERIK 840D sl Function Manual

Connecting Sensors/Actuators

7.3 Safe programmable logic (SPL)

7.3 Safe programmable logic (SPL)
7.3.1

Fundamentals

Function
These signals must be logically combined (interlocked) in a safety-relevant, freely
programmable form in order to be able to flexibly process safety-relevant external
process signals and safety-relevant internal input and output signals. The "Safe
Programmable Logic" (SPL) handles this task as an integral system component.
Features:
S Logic operations implemented by the user are cyclically processed.
S Instructions are effective in all operating modes.
S The PLC program immediately starts to execute the instructions after the con-
trol has booted.
S The SGEs/SGAs must be supplied by the machinery construction OEM – both
in the drive monitoring channel as well as in the NCK monitoring channel.
S The NCK-SPL is written as ASUB using the CNC function synchronous actions.
The PLC-SPL is written as PLC user program.
In order to check that the two SPLs (PLC and NCK) are functioning, the system
program arranges cyclic data comparison between the PLC and NCK.
Max. 64 safety-related sensors
can be directly connected
(e.g.: mode switch, light
barriers, Emergency Stop,...)
Fig. 7-18
7-196
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
SGEs
Crosswise result and
data comparison
SGEs
Safe programmable logic
SGAs
NCK-SPL
Max.
actuators can be connected
(e.g.:
interlocking, motor brakes, ...)
PLC-SPL
SGAs
© Siemens AG, 2006. All rights reserved
03.06
64 safety-related
protective door