Siemens SINUMERIK 840D sl Function Manual page 82

Basics on the Safety Functions Integrated in the System/Drive
5.3 Forced checking procedure
Note
The test interval duration of 8 hours may only be extended under the following
conditions:
S In the time after the test interval has expired, no hazards for personnel may be
allowed to occur – they must be completely excluded (e.g. the protective door
is closed and is also interlocked)
S After the test interval has expired, before a possible hazard to personnel (e.g.
for a request to open a protective door), a test stop or a forced-checking
procedure must be carried-out to absolutely ensure the availability of the
shutdown paths and the safety-related inputs/outputs.
This means that for the duration of the automatic mode (with the protective door
closed and interlocked), the fixed 8-hour cycle isn't strictly specified. When the 8
hours expires, in this case, the forced-checking procedure can be linked to the
next time that the protective door is opened.
For axes where safety-relevant motion monitoring functions have been configured,
this also applies to the forced checking procedure of the functions integrated in the
drive (see Chapter 4 "Safety functions integrated in the drive") – even if these
functions are controlled by local terminals.
Note
If the crosswise data comparison identifies an error, then this results in a stop
response (see Section 6.3 "Safe Stops A-F").
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
© Siemens AG, 2006. All rights reserved
03.06