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6
6-2
For all examples, please also observe the measures specified in the individual tables,
which must be taken to achieve the specified SIL/SIL CL/Cat./PL and all measures
according to standards EN 61508, EN 62061, EN 954-1, and EN ISO 13849-1 to
achieve the specified SIL/SIL CL/Cat./PL.
WARNING: Disregarding this warning may lead to the loss of the safety function
An external voltage may not be supplied in an output (e.g., via cross circuits). These
errors can adversely affect the operation of the module (or even destroy the module) and
thus result in the loss of the safety function. Therefore, these errors must be prevented.
Install the connecting cables for connecting the actuators so that they are protected
against cross circuits.
Please observe the load capacity of the outputs according to the technical data in "Safe
digital outputs" on page 2-3.
6.2
Notes on the protective circuit for external
relays/contactors (free running circuit)
K 1
6 9 4 0 0 0 2 1
Figure 6-1
Example of the free running circuit for an external relay
–
Limit the voltage induced on circuit interruption to < -15 V (e.g., with RC elements,
suppressor diodes or varistors).
–
Please note that the free running circuit affects the fall time and the service life of the
contactor.
–
Please observe the specifications of the relay manufacturer when sizing the relay
protective circuit.
User manual IC220SDL953 - September 2011
GFK-2731
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