32 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Chapter 4 Safety Function
Due to vibrations often present in industrial applications, the number of
physically interrupted beams is allowed to be one less than the specified number
of beams. A local adjustment of this tolerance value -1 is not possible with DIP
switches.
If the fixed blanked object only blocked one beam, the tolerance value is zero.
This value means that a minimum of one beam has to be blocked, there is no
tolerance.
The 450L-E safety light curtain can perform fixed blanking of one or more
adjacent beams. Minimum one of the two synchronization beams (Figure 8 on
page 22) must be unblocked before and during the Teach-in procedure.
A teach-in error occurs if one of the cases that are described in Table 4
(see
Figure 11 on page 32
for illustration) happens:
Table 4 - Teach-in Errors and Behavior
Two set ups that cause teach-in blanking error:
• Case A: Number of objects > 4
• Case B: Top and Bottom end interrupted.
Figure 11 - Teach-in Blanking Error
Case Description Behavior
1
More than four independent objects
are in the protective field
In this case, the first four interrupted objects starting from the
connection plug-in is taught, all other objects are not taught.
As a result, the OSSDs stay in the OFF condition as long as the
additional objects are in the protective field.
2
The beams at top and bottom are
simultaneously blocked
In this case, the teach-in command is ignored and the 450L-E
safety light curtain continues operating with the previously
taught objects.
3
One object was moving during
teach-in
In this case, the teach-in command is completed, but the error
indication at the end of the teach-in process warns the user
that the taught limits can cause sporadic OSSD switching.
AB
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