Siemens SINUMERIK 840D sl Function Manual page 98

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Table of Contents

Basics on the Safety Functions Integrated in the System/Drive

5.4 Actual value conditioning

The specific residual risks for 1 encoder systems (refer to Chapter 3.5 "Residual

risks") must be carefully taken into consideration.

2–encoder system

In this case, the safety–related actual values for an axis are supplied from 2 sepa-

rate encoders. In standard applications, the drive evaluates the motor encoder

(IMS) and the NC, the measuring system (DMS). The actual values are generated

in a safety–related fashion either directly in the encoder or in the Sensor Module

and are provided – with no–reaction – to the NCK and the drive using safety–

related communications via DRIVE–CLiQ. A separate connection or a separate

Sensor Module is required for every measuring system.

Sensor Module cabinet mounted

(not used for encoders with

DRIVE–CLiQ interface)

2–encoder system for a feed drive (FD), connected through 2 Sensor Modules

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition

Machine table

Linear scale

Sinamics s120