HEIDENHAIN TNC 640, User Manual, Page: 734 / 948

Manual Operation and Setup | Optional safety concept (functional safety FS)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
17.4 Optional safety concept (functional
safety FS)
Miscellaneous
Refer to your machine manual.
You machine tool builder adapts the HEIDENHAIN safety
system to your machine.
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 integrated safety design from HEIDENHAIN complies
with
Performance-Level d as per EN 13849-1 and SIL 2 as per
IEC 61508. The safety-related operating modes correspond to
EN 12417 and assure 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 control with functional safety.