3.1 Outline
3-2
3.1
Outline
Triggers at preset positions are signals that are output when a moving part of a machine
passes preset reference positions. You can use this function to set signal outputs for up to 32
positions.
The following image shows the operation of triggers at preset positions.
*1.
For triggers at preset positions to function, the speed must be constant for at least 250 μs before the machine
passes a preset position.
*2.
When you set the output width of a signal output at a preset position as a distance, use a distance that does
not exceed the point where deceleration of the constant speed starts.
You can use both high-speed outputs that output signals from line drivers and normal outputs
that output signals from photocouplers for triggers at preset positions. They can also be used
together.
Output circuit specifications for the line-driver and photocoupler output are given below.
Triggers at preset positions are enabled by performing one of the following steps.
Absolute Encoder
Send the Turn Sensor ON command (SENS_ON: 23h) from the host controller.
Incremental Encoder
•
Send the Zero Point Return command (ZRET: 3Ah) from the host controller.
•
Use the Set Coordinates command (POS_SET: 20h) from the host controller to set a reference
point (REFE = 1).
•
If you use triggers at preset positions when the rotational coordinate system is enabled (i.e.,
Pn87A or Pn87C is not set to 0), set the output position so that it falls between Pn87C (First
Rotational Coordinate) and Pn87A (Last Rotational Coordinate). Refer to the following chapter
for details on the rotational coordinate system.
Chapter 4 Rotational Coordinate System
Feedback po
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ition (APO
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)
*1
Not active
Active
Not active
Active
Output time or output di
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tance for
trigger at pre
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et po
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ition 1
Output po
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trigger at pre
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et po
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Trigger at pre
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et po
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Trigger at pre
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et po
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Output po
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trigger at pre
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et po
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S
peed
Time
Output po
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trigger at pre
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et po
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*2
Output po
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ation
for trigger at pre
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et po
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Output time or output
di
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tance for trigger at
pre
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et po
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ition 2
Important
