Rockwell Automation MSR42 Curtains Configuration and Diagnostic Software Tool User Manual - Manual (Page 53)

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Light Curtain Multi-Function Control Module User Manual
Original instructions
Important safety notice:
The operator must ensure that for all Blanking modes, no undetected access is possible into the danger zone via the "blanked" protective field
throughout the whole width of the protective field (also left and right of the "blanked" object). This can be achieved, for example, through the use of
additional mechanical barriers (
Figure 71)
Additionally, the blanked region should be clearly marked, and the protective field should be fully tested with the provided test rods according to the
instructions given in the Micro 400 user manual.
Figure 71: Typical example of "Fixed Blanking"
5.7.1. Teach-in Blanking mode
Teach-in blanking is a version of fixed blanking (See chapter 5.7.2 on page 51), which detects objects that permanently interrupt the protective field. For
Teach-in blanking, a key switch is used to “learn “ which beams are interrupted. This mode is always “with monitoring”, which means that the objects
causing the interruption must remain in this position, otherwise the MSR42 safety outputs will switch off. Due to vibrations often present in industrial
applications, the number of physically interrupted beams is allowed to be 1 less than the taught in number.
With this mode a blanking lamp must always be attached. This lamp has a dual function in that it confirms that a teach-in process has been successful.
Notice:
One or two objects positioned anywhere within the light curtain will be detected and “learned” during this Teach-in process. For each object at least two
adjacent beams must be interrupted.
5.7.2. Fixed Blanking mode
Fixed Blanking is understood to be a continuous interruption of a defined number of adjacent beams, at one specified location in the protective field.
For all other beams, normal safety operation is active. Only the specified beams need to be blanked, i.e. the blanking of the protective area will be
constantly monitored (i.e. "with monitoring"). Due to vibrations often present in industrial applications, the number of physically interrupted beams is
allowed to be 1 less than the specified number of beams. A local adjustment of this "tolerance" value is not possible (
Table 5).
Example:
A 14mm resolution Micro 400 light curtain has 60 beams, which means a protective height of 600 mm. In this example, beam numbers 10 to 15 (6
beams) will be continuously interrupted. In this case Fixed Blanking is configured for beams 10 to 15. It is not allowed for beams 11 to 16, nor 9 to 14 to
be interrupted. If they are interrupted the MSR42 safety output will switch off. However it is allowed for the beams 10 to 14 (five beams), or 11 to 15
(five beams) to be interrupted, and the safety outputs will remain ON. The following condition would also not be allowed
• Beam 10 to 12 interrupted
• Beam 13 not interrupted
• Beam 14 and 15 interrupted
A typical example of fixed Blanking is 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 might vary slightly. This new position may need to be newly configured in order for the
application to run smoothly.
Important safety notice:
For all Blanking modes, the user must ensure that no undetected entry into the dangerous area is possible through the blanked area of the protective
field (i.e. left and right of the object being blanked). This can be achieved for example by mounting additional mechanical barriers (
Figure 71).