2019-12
8
VAA-2E1A-CB10-SJ/E2J-FL, VAA-2E2A-CB10-SJ/E2J-FL
Safety
The wiring and programming of the safety monitor determine whether or not the required safety
function performs correctly. This also applies to the required safety response after a code fault
or failure (see also safety monitor documentation). The safety function (including all safety-
related sensors) must be checked prior to initial commissioning. The safety monitor Perfor-
mance Level or Safety ntegrity Level (S L) must, as a minimum, comply with the Performance
Level or S L required by the application.
f a restart interlock is required for the safety function, this restart interlock must be imple-
mented in the safety monitor.
2.6 Cabling Requirements
The requirements set out in EN/ EC 60204-1 must always be observed. The requirements for
the external cabling and selection of connected switches and/or mechanical contacts are
based both on the level of functionality to be achieved, and on the required category
( SO 13849-1 or EN/ EC 61508).
2.7 Switch or mechanical contact requirements
The switches must be spring loaded. Switches combinations that guarantee an equivalent
safety status (malfunction analysis) can be used.
2.8 Fault Eliminations
Within this device, short circuits on the PCB and within the cable have been eliminated, as
required by SO 13849-2. Maintenance work must include making sure that the individual wire
strands and the device are protected against damage. Route the wire strands as per
EN/ EC 60204-1.
2.9 Transmission Time for Safety-Related Information
Reliable details of the switch-on delay for the device can be found in the data sheet. This delay
affects the switch-off time of the corresponding fail safe circuit.
2.10 Probability of Failure on Demand Calculation
To calculate the probability of dangerous failure on demand (PFD) of a safety-related function,
the PFD values for all components used within this function must be taken into consideration. n
the case of dual-channel applications, the AS- nterface safe input module does not significantly
contribute to the PFD or PFH (probability of dangerous failure per hour) of the overall system.
The PFD and PFH values for single-channel application can be found in the data sheet. The
PFD or PFH values of the other components, in particular the safety monitor, can be found in
the relevant documentation.
Caution!
Protected cable installation
Protect the cable of the safe inputs against mechanical damage in accordance with the require-
ments set out in EN/ EC 60204-1.
f there is a risk of tampering, attach terminal blocks or field-attachable connectors such that
they are inaccessible to operating personnel.
