Siemens SIMATIC ET 200SP Product Information - Page 36

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Glossary

Safety class

Safety level (Safety Integrity Level) SIL according to IEC 61508:2010. The higher the Safety

Integrity Level, the more rigid the measures for prevention of systematic faults and for

management of systematic faults and hardware failures.

The fail-safe modules support operation in safety mode up to safety class SIL3.

Safety function

A mechanism integrated in the → F-CPU and → F-I/O that enables their use in → the fail-safe

system SIMATIC Safety.

According to IEC 61508:2010 A safety function is implemented by a safety system in order to

maintain or force a system safe state in the event of a specific fault.

Safety message frame

In safety mode, data are transferred between the → F-CPU and → F-I/O in a safety message

frame.

Safety mode

Operating mode of → F-I/O that enables → safety-related communication via → safety

message frames.

→ ET 200SP fail-safe modules can only used in safety mode.

Safety program

Safety-related user program

Safety-related communication

Communication used to exchange fail-safe data.

Sensor evaluation

There are two types of sensor evaluation:

→ 1oo1 evaluation – sensor signal is read once

→ 1oo2 evaluation – sensor signal is read in twice by the same F-module and compared

internally

Sensors

Sensors are used for accurate detection of digital and analog signals as well as routes,

positions, velocities, rotational speeds, masses, etc.

ET 200SP distributed I/O system

Product Information, 07/2013, A5E32288220-AA