Siemens SLI-5310 Betriebsanleitung PDF herunterladen (Seite 24)

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The term Functional Safety designates

HEIDENHAIN encoders that can be used

in safety-related applications. These encod-

ers operate as single-encoder systems

with purely serial data transmission via

EnDat 2.2. Reliable transmission of the

position is based on two independently

generated absolute position values and on

error bits. These are then provided to the

safe control.

Basic principle

HEIDENHAIN measuring systems for safe-

ty-related applications are tested for com-

pliance with EN ISO 13 849-1 (successor to

EN 954-1) as well as EN 61 508 and

EN 61 800-5-2. These standards describe

the assessment of safety-related systems,

for example based on the failure probabili-

ties of integrated components and subsys-

tems. This modular approach helps the

manufacturers of safety-related systems to

implement their complete systems, be-

cause they can begin with subsystems that

have already been qualiﬁ ed. Safety-related

position measuring systems with purely

serial data transmission via EnDat 2.2 ac-

commodate this technique. In a safe drive,

the safety-related position measuring sys-

tem is such a subsystem. A safety-related

position measuring system consists of:

• Encoder with EnDat 2.2 transmission

component

• Data transfer line with EnDat 2.2

communication and HEIDENHAIN cable

• EnDat 2.2 receiver component with

monitoring function (EnDat master)

In practice, the complete “safe servo

drive” system consists of:

• Safety-related position measuring

system

• Safety-related control (including EnDat

master with monitoring functions)

• Power stage with motor power cable

and drive

• Physical connection between encoder

and drive (e.g. rotor/stator connection)

Safety-related position measuring systems

Field of application

Safety-related position measuring systems

from HEIDENHAIN are designed so that

they can be used as single-encoder

systems in applications with control

category SIL 2 (according to EN 61 508),

performance level “d”, category 3

(according to EN ISO 13 849).

Additional measures in the control make it

possible to use certain encoders for appli-

cations up to SIL-3, PL “e”, category 4. The

suitability of these encoders is indicated

appropriately in the documentation (cata-

logs / product information sheets).

The functions of the safety-related position

measuring system can be used for the

following safety tasks in the complete

system (also see EN 61 800-5-2):

Complete safe drive system

Safety-related position measuring system

EnDat master

Encoder

Power cable

Safe control

Drive motor

Power stage

SS1

Safe Stop 1

SS2

Safe Stop 2

SOS

Safe Operating Stop

SLA

Safely Limited Acceleration

SAR

Safe Acceleration Range

SLS

Safely Limited Speed

SSR

Safe Speed Range

SLP

Safely Limited Position

SLI

Safely Limited Increment

SDI

Safe Direction

SSM

Safe Speed Monitor

Safety functions according to EN 61 800-5-2

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