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Chapter2
OS32C
User’s Manual
Operating States & Output Modes
Reference Boundary Monitoring (RBM)
The OS32C has the ability to reference and monitor the presence of pre-determined areas (beams)
within the boundary being guarded, i.e. walls, doorways, etc. Reference boundary monitoring (RBM) is
normally used in vertical guarding installations, see Fig. 2-2.
The RBM function allows users to select certain areas on the detection zone (safety or warning)
boundary and program them to detect continuous presence. This function is intended to prevent
unauthorized changes in the physical position of the OS32C scanner.
• When RBM is enabled for the safety zone, the area (beams) that has been activated will cause a
transition to a machine stop state when a distance change is sensed.
• When RBM is enabled for a warning zone, the area (beams) that has been activated will cause a
transition of the corresponding auxiliary output when a distance change is sensed.
For complete directions on setting up reference boundary monitoring, see page 70.
Per the international standard IEC 61496-3, area scanners used in applications where the angle of
approach exceeds +/- 30 degrees with respect to the detection plane, must use reference boundary
monitoring (RBM) of the detection zone. The tolerance zone for (RBM) must NOT exceed 100mm.
The OS32C response time must not exceed 120ms, as the OS32C must detect objects moving at 1.6
meters per second. If the detection zone is infringed or if the detection zone boundaries are changed,
the scanner shall turn off the two OSSD outputs
Fig. 2-2 Reference Boundary Monitoring
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