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Command Reference: Function Blocks
Section 6-5
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Sequential Muting (Forward Direction)
In this example, four Through-beam Photoelectric Sensors are set up as the
sensors with intersecting detection zones.
Use this configuration when the length of the workpiece being transported is
longer than a fixed length.
Block Diagram
MS11: Muting sensor connected to Muting Signal 11
MS12: Muting sensor connected to Muting Signal 12
MS21: Muting sensor connected to Muting Signal 21
MS22: Muting sensor connected to Muting Signal 22
Muting Sequence
1. In the block diagram above, the light is not interrupted between MS11,
MS12, MS21, and MS22 and the light curtain, so the Output Enable signal
is ON.
2.
As the workpiece moves to the right and MS11 and MS12 go ON in order,
muting is enabled, and the Muting Status goes ON.
3.
As the workpiece continues advancing, the Output Enable signal is kept
ON even if the light curtain is obstructed.
4.
As the workpiece continues advancing, light from MS21 is no longer inter-
rupted by the workpiece, the muting status is cleared, and the Muting Sta-
tus goes OFF.
Setup Distances
The following formulae show the minimum distances of D2 and D3 required
for the muting sensors to provide effective muting function operation:
Formula 3: D2 < L
Formula 4: D3 < L
L: Length of the workpiece
The following formula shows the maximum distance of d2 required for the
muting sensors to provide effective muting function operation:
Formula 5: V × T1min < d2 < V × T1max
V: Transit speed of the workpiece
T1min: NEA1-series Controller cycle time
T1max: Synchronization time setting time
The default setting is 3 s.
V
MS11
MS11
MS12
MS12
MS21
MS22
MS21
MS22
Workpiece
L
D3
V
Light curtain
d2
D2
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...