206 Rockwell Automation Publication 450L-UM001D-EN-P - December 2019
Appendix B Typical Installations
Fixed Blanking Application
This application can include a sheet of metal that passes through the light curtain
before an operation is performed to form the material. The light curtain permits
the material at a specific width without causing the safety outputs to turn off.
Certain applications cannot be protected in any other way. If, for example,
normal operation of a machine requires that material is permanently fed into the
dangerous part of a machine, then a portion of the protective field is always
interrupted, but the machine nevertheless continues to operate. The protection
with blanking must come from a detailed risk analysis. Authorized personnel
must confirm that in spite of blanking, the safety of the machine operator is
adequately accounted for. When necessary, additional protective measures must
be taken to shield the dangerous area. All Blanking modes can create “holes” in
the protective field. These “holes” must be considered separately in the risk
analysis.
Figure 191 - Schematic Application for Fixed Teach-in Blanking
A typical example of fixed Teach-in blanking is also the exit ramp on an
automatic punch press. The punched part is transported out of the dangerous
zone into a container. The ramp passes through the protective field, and without
Blanking would cause the machine to stop. The position of this ramp is
monitored. During a tool change, the position of this ramp may vary slightly.
This new position must be reconfigured in order for the application to run
smoothly. It is possible this new position needs reconfiguration in order for the
application to run smoothly.
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