Detection Options; Fixed Blanking - Omron MS2800E Operation Manual

Safety light curtain type 2

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Table Of Contents

Table of Contents

!WARNING

5-1

Fixed Blanking

Use of Fixed Blanking and Floating Blanking will make an MS2800 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.

Light Curtain

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

Standard Resolution

14 mm

30 mm

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.