Safe Software Cams (4 Cam Pairs) - Siemens Sinumerik 840D sl Function Manual

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Safety functions integrated in the system/drive

6.8 Safety software cams and safety cam track (SN)

The lowest possible tolerance bandwidth (less than 5--10 mm) should be selected

for the "safe software cams" function. It makes sense to parameterize the cam

tolerance greater than or equal to the actual value tolerance.

Effects when SN responds

When defining cam positions, please note that the function only monitors the

actual position thus making (predictive) sensing of cam signals impossible.

The cams are only considered as being safe if they were safely referenced. This is

the reason that the user must link this SGA in the SPL with the corresponding

SGA of the cam functionality.

Response times

S Response times without cam synchronization

typical 1 interpolation clock cycle + 1.5 monitoring clock cycles

mMaximum 1 position controller clock cycle + 4 monitoring clock cycles +

2 interpolation clock cycles + 3 PLC cycles

S Response times with cam synchronization

typical 1 interpolation clock cycle + 2.5 monitoring clock cycles

maximum 1 position controller clock cycle + 5 monitoring clock cycles +

2 interpolation clock cycles + 3 PLC cycles

Safe software cams (4 cam pairs)

If more than 4 cam pairs are required, then the "safe cam track" function must be

used (refer to Chapter 6.8.2, "Safe cam track").

There are 4 pairs of cams (SN1, SN2, SN3, SN4) available for each axis. Each

cam pair consists of a plus cam (SN1+, SN2+, SN3+, SN4+) and a minus cam

(SN1--, SN2--, SN3--, SN4--). Each cam signal can be individually enabled and

configured via machine data. The cam signals are output via SGAs.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

Sinamics s120