6.5 Origin Settings
6.5.2 When Using an Incremental Encoder
6-13
When using a rotary type coordinate (Pn637 ≠
n.
0), set the results in Pn63C after perform-
ing the following calculations so that the following relationships are satisfied: Pn63A ≤ Pn63C ≤
Pn638.
• If the results is smaller than Pn63A (the starting point of the rotational coordinates), add the
width of the coordinates (Pn638 − Pn63A + 1).
• If the results is larger than Pn638 (the end point of the rotational coordinates), subtract the
width of the coordinates (Pn638 − Pn63A + 1).
Refer to the following manual for information on setting up an absolute encoder.
Σ-7-Series Σ-7S SERVOPACK with Analog Voltage/Pulse Train References Product Manual
(Manual No.: SIEP S800001 26)
6.5.2
When Using an Incremental Encoder
If you use an incremental encoder, you must set the origin every time the power supply to the
equipment is turned ON.
Homing is used to define the machine origin. Refer to the following section for details on hom-
ing.
7.2 Homing on page 7-4
The setting of Pn63C is set as the current value when the power supply is turned ON or when
homing is completed.
You must define the origin again if you change the settings of any of the following parameters:
Pn20E, Pn210, Pn205, Pn637, or Pn63C. Always turn the power supply OFF and ON again
before you set the origin to enable changes to these parameters.
Pn63C
Origin (Incremental Encoder)
Absolute Encoder Offset (Absolute Encoder)
Setting Range Setting Unit Default Setting When Enabled Classification
-1073741823 to
+1073741823
Reference unit 0 After restart Setup
If you are using an incremental encoder, always perform homing before you start program
table operation. If you perform program table operation without performing homing, posi-
tions cannot be managed so correct positioning may not be possible.
Unexpected machine operation, failure, or personal injury may occur.
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