Festo 1971599, Manual

Page: 17 / 150

Contents and general instructions
XV
Festo P.BE-CPX-FVDA-P2-EN en 1209NH English
Attainable safety level
With the CPX-FVDA-P2, safety functions can be implemented
up to:
– safety integrity level SIL 3 in accordance with IEC 61508
– performance level e, cat. 3 in accordance with
EN ISO 13849-1.
The CPX-FVDA-P2 achieves an SIL performance limit of max.
SIL CL3 in accordance with EN 62061.
The attainable safety level of the entire safety system de-
pends on other components used to implement the safety
function.
To maintain the safety level:
•
Check the operational capability of the safety equipment
at adequate intervals.
Failures due to common cause (common cause failure – CCF)
Common cause failures cause the loss of the safety function,
since both channels (P and M) in a two-channel system fail
simultaneously.
Through the following measures, you ensure that common
cause failures are avoided:
– Observe operating voltage limits
– Comply with temperature range
– Use max. 2 output channels in a shared safety-oriented
control circuit
Additional measures for avoidance of common cause faults
may result from the application.