Reer EOS4 User Manual

EOS4 SAFETY LIGHT CURTAIN
8540733 • 10th February 2009 • Rev.1 23
English
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)
RED BLINKING
3
OFF
MASTER : Light curtain free;
SLAVE : Light curtain(s) occupied
RED Flashing
Table 16 – RX light signals EOS4 (Master)
(A) Light curtain occupied - outputs disabled
(B) Light curtain free - outputs disabled - awaiting restart
(C) Light curtain free - outputs enabled
TEST function
The test function simulates the occupation of the protected area, allowing checking by an
external supervisor (e.g. PLC, control module, etc.) of the correct operation of the entire
system. Via an automatic fault detection system, the EOS4 light curtain is able to verify
occurrence of a fault independently within the response time (declared for each model).
This fault detection system is always active and does not require any external
intervention. The TEST command is available in the case in which the user wishes to
check the devices connected downstream of the light curtain (without physically
intervening inside the guarded area). This command interrupts emission of the beams on
the emitter and makes it possible to switch the OSSD from ON to OFF status as long as
the command is active.
Î
The minimum duration of the TEST command must be at least 4 msec.
Status of the outputs
On the Receiver of the EOS4 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 60Ω. The maximum load capacity corresponds to 0.82µF. 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
OSSD2
24VDC Light curtain free condition.
OSSD1
OSSD2
0VDC
Light curtain occupied
or fault detected condition
Table 17 - Status of the outputs
 In free protected area conditions, the Receiver provides a voltage of 24VDC on both
outputs. Therefore, the established load must be connected between the output
terminals and the 0VDC (Figure 24).

Reer EOS4 Specifications

General

Power Supply	24 VDC ±20%
Resolution	14 mm
Safety Category	Type 4
Operating Temperature	+55 °C
Protection Rating	IP65
Detection Capability	Opaque objects
Connection	M12 connector
Response Time	≤ 20 ms
Outputs	2 x safety outputs (OSSDs)