HEIDENHAIN TNC 620 Programming Station, User Manual

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Optional safety concept (functional safety FS) 14.4
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HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
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14.4 Optional safety concept (functional
safety FS)
Miscellaneous
You machine tool builder adapts the HEIDENHAIN
safety design to your machine. Refer to your machine
manual.
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 per EN 13849-1 and SIL
2 as per IEC 61508, features safety-related modes of operation
in accordance with EN 12417, 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.