KEYENCE SL-R12EX - Manual (Page 19)

Chapter 2 Functions
2-3
2
ENGLISH
2-4 Blanking blind protection function
WARNING
Enabling the blanking blind protection function does not necessarily remove all
hazardous zones allowing human approach. Depending on the target machine,
installation of the blanking blind protection unit may result in the creation of one or
more hazardous zones allowing human approach. Be sure to read “4-4 Blanking
blind protection function” (
➮4-4) in this manual before installing or using this unit.
When installing the SL-C Series into/onto a machine, always follow the instructions
in the SL-C Series Instruction Manual. Failure to follow this warning may result in
significant harm to machine operators, including serious injury or death.
This function is an advanced improvement of the fixed blanking function.
It can be used to eliminate the hazardous zone allowing human approach
that arises when the conventional fixed blanking function is enabled.
(Subject to the above warning.)
A blanking blind protection unit (SL-C08SB or SL-C16SB) is required in
order to enable this function. As shown in the right diagram, the blanking
blind protection unit is placed on either side of the obstacle so that the SL-C
Series transmitter faces the blanking blind protection unit's receiver, and the
blanking blind protection unit's transmitter faces the SL-C Series receiver,
with all beam axes aligned. This configuration may eliminate the hazard-
ous zones allowing human approach that are created by the obstacle.
Be sure to read “4-4 Blanking blind protection function” (
➮4-4) carefully
for more information about how to set and install this unit before use.
2-5 Muting function
2-5-1 Muting function
DANGER
• The muting function deactivates the light curtain's safety functions while the light
curtain detects the input signal from two or more muting devices (sensors,
switches, etc.). The muting devices (sensors, switches, etc.) that are used to carry
out the muting function as well as the method to install them must satisfy all
conditions described in this instruction manual as well as the applicable require-
ments imposed by all laws, regulations, standards, and ordinances in effect in the
country and region where the SL-R12EX is to be used. Failure to follow this
warning results in significant harm to machine operators, including serious injury
or death.
• The following conditions must be considered before installing muting devices
(sensors, switches, etc.) to carry out the muting function.
1. The muting function of the light curtain is only permitted during the nonhazard-
ous portion of the machine cycle.
2. Muting devices must not get active and the light curtain (SL-C Series) must
not go to the muting state even if a person inadvertently approaches the light
curtain's detection zone.
These are minimum requirements. Always follow the regulations in effect in the
country and region where the SL-R12EX is used.
In addition, you must take note of the following information if you carry out the
muting function.
• Muting of the light curtain shall be accomplished in such a manner that no
single component failure shall prevent the normal stop command and shall
prevent subsequent machine cycles until the failure is corrected. (ANSI B11.19)
• Setting the muting function and muting device configuration must be restricted
to an extremely limited number of the responsible personnel.
• Any personnel other than the responsible personnel must not easily change
the position at which the muting devices are installed. When the muting de-
vices are moved, the procedure must require the use of specialized tools and
must be performed under the responsibility of the responsible personnel.
Blanking blind protection unit
Obstacle
SL-C Series