ABB BT50T 매뉴얼 - 페이지 12

{카테고리_이름} ABB BT50T에 대한 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. ABB BT50T 16 페이지. Safety relay / expansion relay

System Structure

The following assumptions have been made during the FMEDA analysis:

The device shall claim less than 35% of the total failure budget for a SIL3 safety loop.

Failure rate based on the Siemens SN29500 standard. 2004-01

Failure rates are constant, wear out mechanisms are not included.

External power supply failure rates are not included.

The safety-related device is considered to be of type A components with a Hardware Fault Tolerance of 1.

It is assumed that the device will be used under average industrial ambient conditions according to the

technical data.

Safety Function

When the input of the BT50 is de-energized, the output is de-energized. When the input of the BT50T is de-

energized, the output is de-energized according to the time settings.

Safe state

The safe state is when all three NO safety outputs are de-energized.

Switching Frequency

The maximum switching frequency in the safety relevant input is 0,3 Hz.

2TLC172316M0201, rev E

2015-09-30