Safe Software Cams (Sn); Safe Software Cams - Siemens SINUMERIK 840D sl Function Manual

03.06
6.8

Safe software cams (SN)

Description
The "safe software cams" function (SN) can be used to implement safe electronic
cams, safe range detection or limiting the working zone/protective zone for specific
axes, thereby replacing the hardware solution.
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 con-
figured via machine data. The cam signals are output via SGAs.
Warning
!
The enabled cam signals are immediately output when the control system is
powered-up, this output is however only safe after safe referencing (this is
signaled using the SGA "Axis safely referenced").
The cams are only considered as being safe if they were safely referenced. This is
the reason that the user must interlock this SGA with the cam SGA.
Features
The most important features include:
S Cam positions are safely defined and evaluated as a software function
S Working ranges/zones are defined
Preconditions
The following prerequisites must be fulfilled for the "safe software cams" function:
S The axis/axes must have been safely referenced (user agreement)
S The safe cams must be configured:
The required cams are enabled using machine data
for 840D sl:
36901: $MA_SAFE_FUNCTION_ENABLE, bits 8...15 and parameter
for SINAMICS S120:
p9501: SI motion, enable safety functions, bits 8...15
SGA assignment is defined using machine data
for 840D sl:
36988: $MA_SAFE_CAM_PLUS_OUTPUT[n] and
for SINAMICS S120:
36989: $MA_SAFE_CAM_MINUS_OUTPUT[n]
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Safety Functions Integrated in the System/Drive
6.8 Safe software cams (SN)
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