Siemens Sinumerik 840D sl Function Manual page 185

Sinumerik safety integrated

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In the case of a fault, SGAs can assume a value of "0" (e.g. as a result of the cam

synchronization between monitoring channels, loss of the safety--related

referencing etc.). The user must take this into account so that when the SGAs are

further processed, in a fault condition, no unsafe (hazardous) machine states can

occur (that means, for example, safety door enabling only with value "1").

Further, the SGAs "cam range" may only be evaluated as supplementary

information to SGA "cam track". It is not permissible to evaluate the SGA "cam

range" alone without evaluating the SGA "cam track".

Hysteresis of cam SGAs

The hysteresis is applied both to the SGA "cam track" as well as to SGA "cam

range" to prevent signal flutter. This means the SGAs are therefore generated as

follows in the two monitoring channels, NCK and drive:

SGA "cam track" / SGA "cam range"

SGA "cam track 2"

Figure 6-21 SGA "cam track" and "cam range" with hysteresis

As a result of the cam hysteresis, for increasing actual values, the cams SGA do

not switch at the configured cam position (SN) but at the position increased by the

cam tolerance (hysteresis) (SN+TOL).

Users must carefully take this into consideration when configuring the cam

positions and cam tolerance.

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

Safety functions integrated in the system/drive

6.8 Safety software cams and safety cam track (SN)

SGA "cam range"

Sinamics s120