Siemens ULTRAMAT 6F Güvenlik Kılavuzu - Sayfa 11

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Siemens AG

Device-specific safety instructions

3.1

Applications

The Hardware assessment of the ULTRAMAT 6 shall provide the safety

instrumentation engineer with the required failure data as per IEC 61508 / IEC

61511 and does not include an assessment of software.

The hardware of ULTRAMAT 6 satisfies the special requirements in terms of

functional safety to SIL 1 in accordance with IEC 61508 or IEC 61511-1.

The ULTRAMAT 6 is usable in safety applications to monitor limits.

3.2

Safety function

The ULTRAMAT 6 is mainly used for user defined threshold monitoring. Only

the analog output 4...20 mA (NAMUR) was calculated as safety function. The

dangerous failure is a deviation of the output current of ±5% full span.

Warning

The binding settings and conditions are listed in the "Settings" and "Safety

characteristics" sections. These conditions must be met in order to fulfil the

safety function.

When the safety function has been executed, safety-instrumented systems

with no self locking function should be brought to a monitored or otherwise

safe status within the Mean Time To Repair (MTTR). The MTTR is 8 hours.

The calculated Mean Time Between Failure (MTBF) for ULTRAMAT 6 is 50

years.

Reference

Instruction manual ULTRAMAT 6 E/F, OXYMAT 6E/F (Order number see

chapter 1.3)