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Command Reference: Function Blocks
Section 6-5
Override Function
The Override function can turn ON the safety output ON even though the light-
interruption signal of the light curtain is inactive. If a workpiece gets jammed
during transit as shown in the following diagram, the system cannot be
returned to normal operation without forcibly removing the workpiece. In a sit-
uation like this, the Override function can be used to move the workpiece out
of the light curtain detection zone.
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
Override Sequence
1. In the block diagram above, the Output Enable signal is OFF.
2.
When the Override Input goes ON, the Override function starts and the
Override Status goes ON. As long as the Override inputs are ON, the mut-
ing status is
forcibly enabled, and both the Muting Status and Output Enable signals are
ON.
3.
When the workpiece moves to the right until it is no longer detected by the
MS12, the muting status forced by the Override function will be cleared,
and both the Muting Status and Override Status will go OFF.
■
Override Start and Stop Conditions
■
Start Conditions
If the following conditions are met, the Override function will start and the Out-
put Enable, Muting Status, and Override Status will all go ON.
1. At least one Muting Signal is ON.
2.
The light curtain is inactive (obstructed).
3.
The Output Enable is OFF.
4.
The Override Input is ON (when set as a Single input) or Active (when set
as Dual inputs).
Light curtain
MS11
Reflected
Board
MS12
WORK
Reflected
Board
Summary of Contents for NE1A-SCPU01 - 07-2009
Page 3: ...iv...
Page 9: ...x TABLE OF CONTENTS...
Page 11: ...xii...
Page 15: ...xvi...
Page 70: ...35 Installation Section 3 1 Top Top Bottom Bottom...
Page 72: ...37 Installation Section 3 1 3 1 3 Dimensions and Weight Dimensions NE1A SCPU01 V1...
Page 85: ...50 Wiring Section 3 2...
Page 123: ...88 Explicit Message Communications Section 4 7...
Page 141: ...106 Safety Outputs Section 5 4...
Page 257: ...222 Connection Status Tables Section 10 8...
Page 261: ...226 NE1A series Controller Replacement Section 11 2...
Page 264: ...229 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 266: ...231 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 267: ...232 Appendix A Local Output Setting Example...
Page 269: ...234 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 270: ...235 Appendix A Local Output Setting Example...
Page 273: ...238 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 275: ...240 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 276: ...241 Appendix A Local Output Setting Example...
Page 289: ...254...
Page 293: ...258 Index...