Inxpect SRE 200 Series

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3.4.6 Dual channel safety output configuration

The dual channel safety output is automatically obtained by the Inxpect Safety application and it only matches

the single OSSD outputs as follows:

OSSD 1 with OSSD 2

OSSD 3 with OSSD 4

In the dual channel safety output, the output status is the following:

activated output (24 V DC): no motion detected and normal functioning

deactivated output (0 V DC): motion detected in the detection field or failure detected in the system

The idle signal is 24 V DC, periodically shortly pulsed to 0 V for the receiver to detect short-circuits to either 0 V

or 24 V.

The pulse duration at 0 V (T

) can be set at 300 μs or 2 ms through the Inxpect Safety application (Settings >

Digital Input-Output > OSSD Pulse width).

Note: the devices connected to the OSSD should not respond to these temporary, self-diagnostic 0 V pulses of the

signal.

For details, see "Technical references" on page104.

3.4.7 OSSD diagnostic checks

Per default, the OSSD Diagnostic check (e.g., for short-circuits) is deactivated. This check can be activated

through the Inxpect Safety application (Settings > Digital Input-Output).

If activated, the control unit will monitor:

short-circuit between OSSDs

24 V short-circuit

open circuit (only trips on demand, i.e., when the safety function is activated on the transition from 24 V to

GND)

Note: the short-circuit to GND (fail-safe fault) is always monitored even if the OSSD diagnostic check is

deactivated.

WARNING! If an external common cause failure leads to a 24 V short-circuit on both the OSSDs, the

control unit cannot communicate the safe state condition via OSSD. The integrator is responsible for

avoiding this condition by monitoring the test pulses generated periodically on the OSSDs.

3. Get to know Inxpect SRE 200 Series

Inxpect SRE 200 Series - Page 25