schmersal SLC 410 B Instructions De Montage Et De Raccordement page 69

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 410 B / BM light curtain 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 (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 3 (page 11) for details about the use of the test
function.
The minimum duration of the TEST function must be 40 msec.
OUTPUT STATUS
The SLC 410 B / BM 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.
NAME OF SIGNAL
OSSD1
OSSD2
OSSD1
OSSD2
In the protected area clear condition, the Receiver supplies a voltage of 24VDC on
both outputs. The required load must therefore be connected between the output
terminals and the 0DVC (Figure 29).
CONDITION
24VDC
0VDC
Table 10
Maximum
load 500mA
Figure 29
MEANING
Light curtain clear condition
Light curtain engaged condition or failure
detected
Maximum
load 500mA
31