Technical specifications
14.6 Insulation, protection class, degree of protection and rated voltage
Distributed I/O system
286 System Manual, 09/2019, A5E03576849-AJ
Information on PFDavg, PFH values for ET 200SP F
PFDavg and PFH values for F-CPUs at operating altitudes up to 5,000 m. Below you will find
the probability of failure values (PFDavg and PFH values) for the F-CPUs with a service life
of 20 years and with a repair time of 100 hours:
Operation in low demand mode in accordance with
IEC 61508:2010:
PFDavg = Average probability of a dangerous
failure on demand
Operation in high demand or continuous mode
in accordance with IEC 61508:2010:
PFH = Average frequency of a dangerous failure
[h-1]
-safe I/O modules, the respective specifications for the PFDavg and PFH values in
the product data sheets apply.
14.6 Insulation, protection class, degree of protection and rated voltage
Insulation
The insulation for the I/O modules is dimensioned according to the requirements of
EN 61131-2:2007 and EN 61010-2-201: The insulation for the motor starters is designed in
accordance with the requirements of IEC 60947-1.
Note
In the case of modules with 24 V DC (SELV/PELV) supply voltage, galvanic isolations are
tested with 707 V DC (type test).
Pollution degree/overvoltage category in accordance with IEC 61131 and IEC 61010-2-201
● Pollution degree 2
● Overvoltage category: II
Pollution degree/overvoltage category according to IEC 60947
● Pollution degree 2
● Overvoltage category: III
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