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7 Connection Examples
EDBC250SIO | 2.0
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7 Connection Examples
This section describes examples of applications that make use of the Safety I/O-module
functions to provide a safety function. It also describes the resulting safety ratings.
CAUTION
Using the examples described in this section is not enough to obtain the safety
function needed to reduce the risk as established in the risk assessment
(SIL/Cat./PL).
Personal injury and damage to property

Choose suitable and approved sensors (e.g. to EN 60947-5-1 / -5.) and make
sure that your switching devices have the appropriate B10d value.

You may have to take further actions to obtain the safety function when
using the system together with safe devices, sensor and actuators (e.g.
reading the relay contact signals). Refer to the Operating Instructions of you
safe devices for further details.

Configure your Safety I/O-module with reference to the actual environment.
The safety ratings listed for the examples below solely apply to the part of the safety function
covered by the safe I/O module. Please note that the safety ratings below only apply if the test
pulses are enabled.
WARNING
Non-detection of a corrupt external wiring when test pulse outputs are
disabled
Unsafe machine state, safety hazard

Always use the correct and enabled test pulse output to supply power to
contact-type sensors.

Use the output test pulses to detect cross-faults at the outputs and other
faults.

Note: Consider protecting the cables and/or laying them separately to
ensure a sufficient degree of safety.
WARNING
Reduced diagnosis with deactivated test pulses at the outputs
Switching off the test pulses is expressly not recommended; it may reduce the
safety of the application. When the test pulses at the outputs are switched off,
the diagnosis of the outputs must be maintained:

The outputs must be switched once a year. Switching can be functional (by
application) or by switching the device completely off.