KEYENCE SL-R12EX - Manual (Page 24)

Chapter 2 Functions
2-8
2
English ENGLISH
2-5-2 Two-input muting
The light curtain (SL-C Series) goes to the muting state when it detects the input signals from 2 muting
devices, and the FSD keeps ON-state no matter which beam axes of SL-C Series are blocked.
The following time chart shows the muting function performance when two sensors are used as the muting
devices.
ON
OFF
Clear
Blocked
ON
OFF
ON
OFF
ON
OFF
Sensor A1
Sensor A2
Muting function
Beam reception
FSD
(1) (2) (3)
Less than 3 sec.
20 ms
5 ms
150 ms
24 ms
Time chart explanation
(1) The muting function does not get active when both sensors A1 and A2 are OFF, or when only one of them
is ON. In other words, the light curtain (SL-C Series) keeps normal operation. (The muting function is
OFF.)
(2) The muting function gets active once both sensors A1 and A2 turn ON, and then, the muting lamp turns
ON.
(3) Once either sensor A1 or A2 turns OFF, the muting function is to be inactive. Therefore, the light curtain’s
(SL-C Series) muting state is canceled. The muting lamp turns OFF, and the light curtain (SL-C Series)
returns to normal operation.
Important: * The SL-C Series muting function is designed so that it cannot be active while FSD is OFF-
state. As a result, the SL-C Series does not go to the muting state when any beam axes are
being blocked or when the restart interlock is enabled, even if the signals from the 2 muting
devices turn ON.
* When the SL-R11 receives an E-STOP input signal, the FSD always turns to OFF-state and
the light curtain (SL-C Series) automatically goes to the restart interlock state, even if it has
been in the muting state. When the E-STOP input signal is canceled and the restart input
turns ON, the light curtain (SL-C Series) returns to normal operation, rather than resuming
the set muting state. As a result, in order to return the light curtain (SL-C Series) to the
muting state again, you must temporarily cancel the input signals from the muting devices
that have been activated and resend the input signals from them to the SL-R12EX.
* The SL-C Series cannot go to the muting state after 1 muting device turns OFF, even if both
devices then turn back ON again. Both muting devices must turn OFF to get the muting
function active again.