Safety Function And Safe State - Pepperl+Fuchs SMART KCD2-STC-1 Manual

Functional Safety KCD2-STC-(Ex)1(.SP), HiC2025(A)
Planning
3.3

Safety Function and Safe State

Safety Function
The device transfers analog signals from the input to the output with a tolerance of 2 % related
to the full signal range.
Use the following DIP switch settings for safety-relevant applications:
DIP Switch Settings KCD2-STC-(Ex)1(.SP)
Function
Current source 4 mA to 20 mA
Voltage source 1 V to 5 V
Current sink 4 mA to 20 mA
Table 3.1
DIP Switch Settings HiC2025(A)
Function
Current source 4 mA to 20 mA
Voltage source 1 V to 5 V
Current sink 4 mA to 20 mA
Table 3.2
Safe State
In the safe state, the following values must be reached at the output:
• < 3.6 mA or > 21.5 mA,
• < 0.9 V or > 5.375 V,
Reaction Times
The safety reaction time is the maximum time required from the occurrence of the fault
to the reaction of the outputs in normal operation without faults.
The combined fault detection and fault reaction time is the time in which the device outputs
react to an occurred fault. See chapter 3.4.
Note
See corresponding datasheets for further information.
12
S1 S2 S3
II II I
II II I
II I II
S1 S2 S3
OFF OFF ON
OFF OFF ON
OFF ON OFF
S4
II
I
II
S4
OFF
ON
OFF