KEYENCE SL-R11E - Manual (Page 21)

Chapter 2 Functions
2-9
2
ENGLISH
• Waveforms of control outputs
The SL-R11E performs a self-diagnosis test for the output circuit when all beam axes are clear of any
obstruction and the OSSD is in an ON-state. This self-diagnosis function periodically turns OFF the
OSSD output.
The OSSD output is monitored by the SL-R11E and, if the OFF state signal is fed back, the SL-R11E
determines that the output circuit operates normally.
On the other hand, if the OFF state signal is not fed back, the SL-R11E determines that an error has
occurred in the output circuit or wiring and goes into a lockout condition.
For this reason, all the other devices used to receive the SL-R11E OSSD output must be of the type
that does not respond to this periodic off state.
OSSD1
OSSD2
A
ON
OFF
ON
OFF
B
Approx. 5.3ms
A:Approx. 5 µs B:Approx. 20 µs A and B: the checking
pulse for self-diagnosis
Approx. 4.7ms Approx. 4.7ms
A A B A B
A B A A B A
(When connected to a non-capacitive load.)