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9
SECTION 5
Detection Options
!WARNING
Use of Fixed Blanking and Floating Blanking will make an MS4800 system
less sensitive to objects in the detection zone. Improper use of these features
can result in severe injury to personnel. Fixed Blanking may require a hard
barrier guard. Fixed Blanking and Floating Blanking may require an increase
in the safety distance. Read the following section carefully.
5-1
Fixed Blanking
Fixed Blanking allows a system to blank optical beams and record the exact
pattern. A system can record and store a single pattern. The protected zone's
object detection is then based on the stored pattern. All obstructed optical
beams recorded during the selection must remain blocked and all clear
beams recorded during the selection must remain clear for the system to
enter or remain in the MACHINE RUN state.
A Fixed Blanking pattern may consist of more than one Fixed Blanked area.
Individual Fixed Blanked areas must be separated by at least one beam that
is always clear. A Fixed Blanking area may not crossover between "flexible"
segment boundaries.
Each Fixed Blanked area has a size and positional tolerance of ±1 beam to
allow for slight position variance and only the two beams on the edges of the
blanked area are allowed to vary. Because of this position tolerance, a reduc-
tion of the optical resolution takes place on the border area of Fixed Blanking
patterns. This reduction comprises two beams.
Tolerance effect of Fixed Blanked area on Resolution
Note
The tolerance does not reduce the resolution of the entire light curtain, only
the ends of Fixed Blanked Areas. The user must consider the increased reso-
lution of the two beams at the ends of each Fixed Blanked Area.
Fix
ed Blanking Area
Obstruction
Additional Hard Guarding
Light Curtain
Light Curtain
Detection Zone
Standard Resolution
Effective Resolution at Ends of Fixed Blanked Areas
14 mm
34 mm
30 mm
60 mm
Summary of Contents for MS4800E
Page 2: ......
Page 4: ...iv...
Page 6: ...vi...
Page 20: ...2 Section...
Page 26: ...8 MS4800FS Cascaded Series Section 4 3...
Page 34: ...16 Optical Synchronization Section 5 4...
Page 40: ...22 Selecting Scan Codes Section 7 7...
Page 42: ...24 Auxiliary Output Section 8 2...
Page 52: ...34 General Mounting Considerations Section 10 3...
Page 56: ...38 Connection to a safety relay unit Section 11 3...
Page 60: ...42 Using the test object Section 13 3...
Page 62: ...44 Section...
Page 88: ...70 Accessories Section 15 9...
Page 90: ...72 Section...
Page 97: ...79 EC Declaration of Conformity Section 18 3 18 3 EC Declaration of Conformity...