26
"SYSTEM STATUS" OUTPUT (SLC/SLG 415)
On PIN 4, a signal is available that makes it possible to indicate 2 separate items of information:
1. Status of the OSSD outputs
•
The output signal at 24 VDC or 0 V, according to the status of the OSSDs.
2. Advance warning of contamination (weak signal from Emitter)
•
In case of an advance warning of contamination, the status of the OSSDs is
overlaid by a pulsed signal.
•
The figure below shows the output signals of the status output:
Figure 26
TEST FUNCTION
By means of the test function, which simulates occupation of the protected area, it is possible to
verify the operation of the entire system by means of an external control unit (e.g. SPS, control
module, etc.). The lightbarrier system features an automatic self-diagnosis function that enables it
to detect response time malfunctions (this time is declared for each model).
This safety system is permanently active and does not require any interventions from the outside.
The TEST function is available should the user wish to check equipment connected downstream
of the barrier (without physically entering the protected area). By means of this function the
OSSDs can be switched from ON to OFF as long as the function remains active. Please see
Table 6 for details about the use of the test function.
The minimum duration of the TEST function must be 40 msec.
15
÷
45ms
800ms
OSSD outputs de-activated (no
indication of weak-signal)
OSSD outputs activated (no
indication of weak-signal)
OSSD outputs de-activated and
indication of weak-signal active
OSSD outputs activated and
indication of weak-signal active
Summary of Contents for SLC 415
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