456 Manual Operation and Setup
14.4 Functional Safety FS (Option)
14.4 Functional Safety FS (Option)
General Information
Every machine tool operator is exposed to certain risks. Although
protective devices can prevent access to dangerous points, the
operator must also be able to work on the machine without this
protection (e.g. protective door opened). Several guidelines and
regulations to minimize these risks have been developed within the
last few years.
The HEIDENHAIN safety concept integrated in the TNC controls
complies with Performance Level d as of EN 13849-1 and SIL 2 as of
IEC 61508, features safety-related modes of operation in accordance
with EN 1241 and assures extensive operator protection.
The basis of the HEIDENHAIN safety concept is the dual-channel
processor structure, which consists of the main computer (MC) and
one or more drive controller modules (CC= control computing unit). All
monitoring mechanisms are designed redundantly in the control
systems. Safety-relevant system data are subject to a mutual cyclic
data comparison. Safety-relevant errors always lead to safe stopping
of all drives through defined stop reactions.
Defined safety functions are triggered and safe operating statuses are
achieved via safety-relevant inputs and outputs (dual-channel
implementation), which have an influence on the system in all
operating modes.
In this chapter you will find explanations of the functions that are
additionally available on a TNC with functional safety.
You machine tool builder adapts the HEIDENHAIN safety
concept to your machine. Refer to your machine tool
manual for more information.
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