Ossd, Ossd -5 – KEYENCE SL-V Series User Manual
Page 29
2-2
Self-diagnosis Function
2-5
2
SL-V-M-NO2-E
The OSSD is a safety-related control output. It connects to an external device (load), such as an FSD or
MPCE. The SL-V generates self-diagnosis signals on its internal control circuit to perform diagnostics on
the output circuit (OSSD). These signals periodically force the OSSD into a temporary OFF state when no
interruption exists in the detection zone.
The internal control circuit receives a feed-back signal (OFF signal) based on the self-diagnosis, the SL-
V determines that its output circuit is operating normally. If this OFF signal is not returned to the internal
control circuit, the SL-V determines that there is a problem in its output circuit or wiring and goes to the
lockout condition.
The devices connected to the OSSD, such as safety relay or contactor, should not respond to these tem-
porary, self-diagnostic OFF-signals.
OSSD
A
A
A
A
A
A
A
A
A : 60
μs max.
B : Approx. 10 ms
A
A
A
A
B
B
B
B
B
B
Approx. 100 ms
OSSD1
OSSD2
ON
OFF
ON
OFF
NOTE
Cable
Self-diagnosis
Series Connection
Interlock
AUX
EDM
Wait
State Information
Alert
Clear/Blocked
Suspension
Fixed
Reduced
Monitoring