3
1
4
2
+U
B
0 V
A2
A1
+24 V
IN1
GND
IN2
1
1
Safety logic unit
For an unpowered final stage a
feedback of > 3.5 V will result in
malfunction.
Figure 4 Electrical connection when operating as a 4-conductor
Cross-connection / short circuit
–
Crossing both the outputs (A1 and A2) is detected by the sensor
and results in turning off the outputs (OSSDs) at the next safety
request. The outputs A1 and A2 remain turned off until the fault
is eliminated and a voltage reset has been performed.
–
A cross-connection (short-circuit) between output A2 and the
supply voltage results in turning off of the other output A1 when
there is a safety request. A short-circuit of A1 and UB results in
operation as a 3-conductor (5.2).
–
For an unpowered final stage a feedback of > 3.5 V will result in
malfunction.
–
The device performs self-tests for turn-off capability on A2.
5.2 Operation as 3-conductor
NOTICE
Loss of the safety functionality
When using an output other than A2 the safety functionality is
completely lost.
►
When operating in 3-conductor mode use only A2 as the output (OSSD).
www.balluff.com
21
BES M…-D11 Inductive Safety Sensors
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com
