EOS2 SAFETY LIGHT CURTAIN
LED
MEANING
TWO-COLOUR (Red/Green) YELLOW
System power-on. Initial TEST RED ON
BREAK condition (A) RED OFF
CLEAR condition (B) OFF ON
GUARD condition (C) GREEN OFF
FAIL condition (Table 18) OFF
RED BLINKING
3
MASTER : Light curtain free;
RED Flashing
SLAVE : Light curtain(s) occupied
Table 16 – RX light signals EOS2 (Master)
(A) Light curtain occupied - outputs disabled
(B) Light curtain free - outputs disabled - awaiting restart
(C) Light curtain free - outputs enabled
Internal TEST function
As required according to EN 61496-1, type 2 safety light curtains must be able to check
their internal circuits at regular intervals for any dangerous faults.
The EOS2 with its integrated automatic fault detection system checks correct functioning
of the light curtain within a maximum of 0,5s and always after switching from CLEAR to
GUARD status.
Periodical system TEST
Equipment connected downstream of the light curtain can be checked (without
necessarily occupying the protected area) using the TEST command on the emitter.
This command enables the OSSDs to be switched from ON to OFF as long as it is active.
Please see
Table 5 for details on how to activate this command.
The test function simulates the occupation of the protected area so that correct
functioning of the devices downstream of the light curtain can be checked by an external
supervisor (e.g. PLC, control unit, etc.).
Î
REER recommend to operate a TEST before each work shift.
Î
The minimum duration of the TEST command must be at least 4 msec.
Status of the outputs
On the Receiver of the EOS2 there are two PNP static outputs whose status depends on
the condition of the protected area.
• The maximum permissible load for each output is 400mA@24VDC, corresponding to a resistive load of 60
Ω
.
• The maximum OFF-state voltage is < 0,5VDC.
• The maximum output current in OFF-state (leakage current) is <2mA.
• The maximum load capacity corresponds to 0.82
μ
F@24VDC.
The meaning of the status of the outputs is illustrated in the table below. Any short-
circuit between the outputs or between the outputs and 24VDC or 0VDC power supply is
detected by the light curtain.
SIGNAL NAME CONDITION MEANING
OSSD1
English
24VDC Light curtain free condition.
OSSD2
OSSD1
Light curtain occupied
or fault detected condition
0VDC
OSSD2
Table 17 - Status of the outputs
8540738 • 2nd December 2009 • Rev.2 23
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