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WARNING: Use of the Banner device for Access or Perimeter Guarding
If a Banner device is installed in an application that results in a pass-through hazard (for example,
perimeter guarding), either the Banner device or the Machine Primary Control Elements (MPCEs) of the
guarded machine must cause a Latched response following an interruption of the defined area.
The reset of this Latched condition may only be achieved by actuating a reset switch that is separate
from the normal means of machine cycle initiation.
Lockout/Tagout procedures per ANSI Z244.1 may be required, or additional safeguarding, as described
by ANSI B11.19 safety requirements or other appropriate standards, must be used if a passthrough
hazard cannot be eliminated or reduced to an acceptable level of risk. Failure to follow these instructions
could result in serious injury or death.
5.1.3 Supplemental Safeguarding
Calculating the Safety Distance (Minimum
As described in
Distance)
on page 20, the EZ-SCREEN LS Basic must be
properly positioned such that an individual cannot reach
through the defined area and access the hazard point
before the machine has stopped.
Additionally, the hazard cannot be accessible by reaching
around, under, or over the defined area. To accomplish this,
supplemental guarding (mechanical barriers, such as
screens or bars), as described by ANSI B11.19 safety
requirements or other appropriate standards, must be
installed. Access will then be possible only through the
defined area of the EZ-SCREEN LS Basic System or
through other safeguarding that prevents access to the
Figure 9
hazard (see
on page 23).
The mechanical barriers used for this purpose are typically
called "hard (fixed) guarding"; there must be no gaps
between the hard (fixed) guarding and the defined area. Any
openings in the hard (fixed) guarding must comply with the
safe opening requirements of ANSI B11.19 or other
appropriate standard.
Figure 9
on page 23 shows an example of supplemental safeguarding inside a robotic work cell. The EZ-SCREEN LS Basic,
in conjunction with the hard (fixed) guarding, is the primary safeguard. Supplemental safeguarding (such as a horizontal-
mounted safety light screen as an area guard) is required in areas that cannot be viewed from the reset switch (for example,
behind the robot and the conveyor). Additional supplemental safeguarding may be required to prevent clearance or trapping
hazards (for example, a safety mat as an area guard between the robot, the turntable, and the conveyor).
WARNING: The Hazard Must Be Accessible Only through the Sensing Field
The installation of the EZ-SCREEN LS Basic must prevent any individual from reaching around, under,
over or through the sensing field and into the hazard without being detected. Mechanical barriers (for
example, hard (fixed) guarding) or supplemental safeguarding may be required to comply with this
requirement, and is described by ANSI B11.19 safety requirements or other appropriate standards.
Failure to follow these instructions could result in serious injury or death.
5.1.4 Reset Switch Location
The EZ-SCREEN LS Basic has a trip output (auto power-up and automatic reset) that turns the OSSD outputs ON when the
defined area is unobstructed (clear). Per application requirements, a latch response requiring a manual reset to a power-up
condition or after an interruption has cleared the defined area might be required. The latch function can be provided by
interfacing the EZ-SCREEN LS Basic OSSD outputs to the machine's safety-related control system, a safety controller
(such as SC22-3 or XS/SC26-2), or safety module (such as the UM-FA-9A/11A).
The system or device providing the latch/reset function must conform to the level of performance required by the risk
assessment. In applications requiring Control Reliability and/or ISO 13849-1 Categories 3 or 4 and PL d or e, it is
recommended that a monitored manual reset (for example, open-closed-open action), such that a shorted or tied-down
button cannot cause a reset be used.
Hard (fixed)
Guarding
www.bannerengineering.com - Tel: 763.544.3164
®
EZ-SCREEN
LS Basic Safety Light Screen
Hard (fixed) Guarding
Area
Guarding
Robot
Turn-
Table
Safety Light Curtain/Screen
Reset Switch
Figure 9. An example of supplemental safeguarding
Opening
Conveyor
Area
Guarding
23
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