Kübler SMC1.3, Safety Manual

Page: 214 / 235

R60047.0002 - Index 2 EN – page 94 / 115
14.2 Connection: unipolar, clocked inputs
Unipolar, clocked inputs are connected as shown below. This type of input reaches a
Safety Integrity Level (SIL) = 1 - 2. Parameter “
IN Config
” must be set to a value
between 20 and 35. Parameter “Input Mode ” must be set to 1 or 2. For clock
generation, one of the outputs must be available. In case of incorrect or missing clock
signal, the tripping function (static high/low) must be chosen in a way that no safety risk
can come up (line interruption and switching failure cannot be detected). In case of
error, a Runtime Readback Digital Output Error will result and the response time will be
approx. 20 ms.
Impacts to the final Safety Integrity Level (SIL):
•
Separate areas for cable leads of switch cables
•
Forcibly guided and redundant series contacts
•
Protected switch terminals to avoid short circuits and shunt faults
•
MTTFd specification if the switch