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Startup Test
The startup test is performed after the device is powered on. The startup test is typically used for
applications involving guard monitoring. The start input is permanently activated by, for example,
bridging. After power up, the safety-related inputs must be deactivated and activated before the
safety-related outputs are activated. This is achieved by, for example, opening and closing the
guard.
1
Activation delay (100 ms): time between activation of safety-related input and activation of safety-related
output
2
Response time (20 ms): time between deactivation of safety-related input and deactivation of safety-
related output
3
Recovery time (200 ms): time that must pass before the safety-related input can be activated again
The timing diagram exemplifies the timing using one safety-related input and one safety-related
output. The same logic applies in the case of multiple safety-related inputs and/or safety-related
outputs.
After power up, the safety-related outputs are not activated before each of the safety-related inputs
has been deactivated and activated again, either concurrently or one after the other, regardless of
sequence. If the safety-related inputs are already inactive at startup (power cycle), the startup test
is considered to have been completed and the safety-related outputs are activated once the safety-
related inputs have been activated and the activation delay has passed. If the safety-related inputs
are active at power up, they must be deactivated and activated again for the startup test to
complete.
HR9Z-B2192 8/2020
Functions
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