mm + 150 mm = 1649 mm (64.9 in). In other words, the leading (outside) edge of the Safety Zone must be 1649 mm
from the nearest hazard.
•
It is recommended to mark the boundary of the Safety/Warning Zone on the floor.
• This example has no factors that would require an increase in the safety distance.
• There is no possibility of easily stepping, climbing or otherwise avoiding detection.
• Because there is no pass-through hazard, the SX can be configured for "automatic start/restart (reset)". However, the
machine control circuitry must be designed so that one or more initiation devices must be engaged (e.g. a conscious
act is required) to start the machine.
• Further, any initiation devices (or reset switches) must comply with the Reset Switch Location.
• For the purpose of this example, the UM-FA-9A Universal Input Safety Module was used and interfaced in a control
reliable (category 3 or 4) method as described in the wiring diagram.
Stationary Area Guarding with Zone Set Switchover
An Area Guarding application can use the Zone Set Switchover function to automatically allow access to one area while
simultaneously guarding another hazardous area. This can improve machine cycle efficiency by allowing the operator to
remove/place parts while the operation is in a different area, for example.
The robot position (i.e., the location of the hazard) is monitored to identify when no hazard exists at one work station, at
which time the Zone Sets are switched. The Zone Set Switchover function is much like a muting application for a safety light
screen.
Figure 5. Sample application with Zone Set Switchover
In addition to the typical considerations for horizontal stationary area guarding, for this example:
•
Ensure that no individual is exposed to a hazard while employing the Zone Set switching function. The risk
assessment should determine the applicability of this function, means of selecting Zone Sets in respect to failure
modes, and whether supplemental safeguarding is required.
• In higher risk applications that require control reliability (category 3 or 4) interfacing, it is highly recommended to use
redundant sensors or switches to initiate or enable a Zone Set change.
• If two Zone Sets are used the Warning Auxiliary output can be used in conjunction with the Warning Zones. If three
Safety Zones are desired (right, left, entire area) then the Warning output pin is required for selecting the Zone Set
(Safety Zone).
Stationary Area Guarding with Multiple Scanners
Area Guarding is frequently used in conjunction with other safeguards, such as interlocked gates on fencing or vertically
positioned safety light screens/grids (for example, perimeter guarding). The purpose of the safeguarding located at the
perimeter of the work cell is primarily to detect entry into the hazardous area, while the area guarding (for example, the SX) is
responsible for preventing machine restart or other machine hazards while the individual remains within the work cell.
In such applications, it is important not to have any voids or unmonitored areas (dead spaces) in the detection capability of
the Area Guarding system. The SX can be configured for irregularly shaped protection fields to accomplish this.
Important: Area Guarding and Perimeter Guarding should not be used in place of Lockout/Tagout
procedures.
SX Safety Laser Scanner
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