Siemens Simatic Manual page 15

Fail-safe function blocks for storage and retrieval machines. distributed safety/tia safety advanced.

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Storage and retrieval machines and safety functions

Monitoring ambient conditions

Is it probable that the subsystem elements always operate within the tempera-

ture, humidity, corrosion, dust and vibration range etc. in which they have

been tested, without the ambient conditions being externally monitored?

Is the subsystem immune to negative electromagnetic influences up to and

including the limits defined in Annex E?

Result

Table 3: Assessing common cause faults according to DIN EN 62061 Annex F.1

S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines

Total number

Factor of the failures resulting

of points

from a common cause (β)

< 35

10 % (0.1)

35 to 65

5 % (0.05)

65 to 85

2 % (0.02)

85 to 100

1 % (0.01)

Table 4: DIN EN 62061 Annex F.2

Users must appropriately select the sensors for the appli-

cation

Users must appropriately select the sensors for the appli-

cation

According to DIN EN 62061 Table F.2: β = 0.02

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