Immuned device/

or Process

Reduction in interruption

Immuned device/

or Process

Reduction in interruption

fr(#)

fr(%)

fr(#)

fr(%)

Nothing

0.00

0.0

Group of processes

Both P1 and P2

3.65

62.6

(A1)

Equipment level

Only contactor

0.00

0.0

Both P1 and P3

2.53

43.4

Only ASD

2.25

38.6

Both P1 and P4

4.15

71.2

(A2)

Only PC1 or PC2

1.40

24.0

Both P2 and P3

1.68

28.8

Only PLC

0.28

4.8

Both P2 and P4

3.30

56.6

(A3)

Only SEMI F47 device

1.90

32.6

Both P3 and P4

2.18

37.4

Process level

Only P1

2.25

38.6

P1, P2 and P3

3.93

67.4

(B1)

Only P2

1.40

24.0

P1, P2 and P4

5.55

95.2

(B2)

Only P3

0.28

4.8

P2, P3 and P4

3.58

61.4

(B3)

Only P4

1.90

32.6

Entire plant

All processes

5.83

100

(C)