Siemens SINUMERIK 840D sl Function Manual page 36
Sinumerik safety integrated
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Brief Description
2.2 SI system structure and basic features
Features of the two-channel, diverse structure
A two-channel, diverse structure is characterized by the following features:
S Two-channel structure with at least 2 independent computers (i.e. computers
with different hardware and software).
S Crosswise result and data comparison with forced checking procedure for the
purpose of detecting internal errors even in functions that are not often used
(dormant errors).
S The computers can access data, reaction-free and decoupled at the shared
(common) interfaces (e.g. actual value input).
Sensing
The actual values of the individual axes are sensed by the sensor modules through
two channels and are provided to the drive and control.
In order to connect sensors and actuators in a safety-related fashion, their process
signals must be connected-in for further processing.
Evaluating
The safety-related functions are executed independently of one another by the
NCK-CPU, PLC-CPU and the drive CPUs. The CPUs cyclically and mutually
compare their safety-related data and results (crosswise data comparison). A test
can be carried-out – initiated by the CPUs – to check the shutdown paths and ac-
tuators (forced checking procedure).
Responding
When the integrated safety-relevant functions respond, the drive processors, the
PLC processor and/or the NCK processor can act on the connected actuators in a
safety-relevant fashion in-line with the actual situation. For example, the appropri-
ate stop responses for the drives can be initiated and the actuators shutdown via
the shutdown paths.
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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
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