Test Function; Output Status - schmersal SLC 412 Instructions De Montage Et De Raccordement

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 supervisor
(e.g. SPS, control module, etc.).
The SLC / SLG 412 light curtain / light grid 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 light curtain / light grid (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 2 for details about the use of the test function.
The minimum duration of the TEST function must be 40 ms.

OUTPUT STATUS

The SLC / SLG 412 features two static PNP outputs on the Receiver, the status of which
depends on the condition of the protected area.
The maximum load allowed is 500mA at 24VDC, which corresponds to a resistive load of
48 . Maxim load capacity corresponds to 2 F. The meaning of the status of outputs is
defined in the table below. Any short circuit between outputs or between outputs and 24VDC
or 0VDC power supplies is detected by the light curtain / light grid.
NAME OF SIGNAL
OSSD1
OSSD2
OSSD1
OSSD2
In the protected area clear condition, the Receiver supplies a voltage of 24 VDC on
both outputs. The required load must therefore be connected between the output
terminals and the 0DVC (Figure 16).
20
CONDITION
24VDC
0VDC
Table 9
Maximum
load 500mA
Figure 16
MEANING
Light curtain / light grid clear condition
Light curtain / light grid engaged condition or
failure detected
Maximum
load 500mA