Floating Blanking - Omron MS4800E - MANUAL 2 Operation Manual

Floating Blanking

5-2 Floating Blanking
!WARNING
5-2-1 Selecting Floating Blanking with selector switches
!WARNING
Use of Fixed Blanking and Floating Blanking will make the 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. Fixed Blanking and Floating Blanking may require an increase in the
safety distance. Read the following section carefully.
One channel can be obstructed at any location in the detection zone as long
as the optical synchronization is maintained. Please refer to chapter 5-4 Opti-
cal Synchronization for further details.
This means that an object can freely float from one end of the protective field
to the other without the MS4800 system entering the MACHINE STOP state.
The obstructed channels are not fixed at a single location but "float" through
the detection zone.
Floating
Blanking
Inactive
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
1
System Exception
Response
MACHINE STOP
Clear Optical Channel
Using the selector switches an authorized user can activate the Floating
Blanking function. This allows the system to operate with one obstructed opti-
cal beam anywhere within the protected zone. This obstruction is permitted
anywhere within the protected zone and is permitted to move over time. After
setting the appropriate selector switches, the receiver enters the Power-On
Self Test state and if no faults are detected the receiver shall enter the INTER-
LOCK or MACHINE RUN condition depending upon the selected operating
mode.
Two-Beam Floating Blanking is not available on the MS4800 system.
Floating Blanking Effects on Minimum Object Resolution
Standard Minimum Object Resolution
(No Floating Blanking)
14 mm
30 mm
1 1
Channel Channel
Floating Floating
Blanking Active Blanking Active
0 1
Exceptions Exception
Machine Machine
Run Run
Optical Channel is obstructed
Minimum Object Resolution with
1 Beam Blanking
24 mm
50 mm
Section 5-2
1 1
Channel Channel
Floating Floating
Blanking Active Blanking Active
2 2
Exceptions Exceptions
MACHINE STOP MACHINE STOP
13