Beckhoff TwinSAFE User Manual download pdf (Page 126)

Circuit examples

124

Application Guide TwinSAFE

Hence:

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Notice

Category

This structure is possible up to category 4 at the most.

CAUTION

Implement a restart lock in the machine!

The restart lock is NOT part of the safety chain and must be implemented in the

machine!

MTTF

d

Designation for each channel

Range for each channel

low

3 years ≤ MTTF

d

< 10 years

medium

10 years ≤ MTTF

d

< 30 years

high

30 years ≤ MTTF

d

≤ 100 years

DC

avg

Designation

Range

none

DC < 60 %

low

60 % ≤ DC < 90 %

medium

90 % ≤ DC < 99 %

high

99 % ≤ DC

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