Brief Description; Control/Drive System - Siemens SINUMERIK 840D sl Function Manual

Brief Description

2.1

Control/drive system

In order to implement safety-related measures, up until now, external equipment
and devices were used – e.g. contactors, switches, cams and monitoring devices.
If a hazardous situation is detected, these devices generally interrupt the power
circuit thus stopping the motion, see Fig. 2-1.
With the integration of safety functions, drive systems and CNC controls perform
safety functions in addition to their functional tasks. Very short response times can
be achieved because of the short data paths from acquisition of the safety-related
information – e.g. speed or position - up to evaluation. The systems with integrated
safety technology generally respond very quickly when the permissible limit values
are violated, e.g. position and velocity limit values. They can be of decisive impor-
tance for the required monitoring result. The integrated safety technology can di-
rectly access the power semiconductors in the drive controller without using elec-
tromechanical switching devices in the power circuit. This helps reduce the
susceptibility to faults – and the integration also reduces the amount of cabling.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
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