8-17
8 Homing
NJ/NX-series CPU Unit Motion Control User’s Manual (W507)
8-4 Homing with an Absolute Encoder
8
8-4-2 Setting Procedure
Precautions for Correct UsePrecautions for Correct Use
After the absolute encoder is set up, the power supply to the OMRON 1S-series Servo Drive or
G5-series Servo Drive must be cycled. When setup processing for the absolute encoder is com-
pleted, an Absolute Value Clear Error (A27.1) will occur in the Servo Drive. Cycle the control
power supply to the Servo Drive to clear this error and complete the absolute encoder setup pro-
cedure.
If you set the Count Mode axis parameter to Rotary Mode, the actual position will be a ring-shaped
counter in the range between the modulo maximum position setting value and the modulo minimum
position setting value. When using an absolute encoder in Rotary Mode, the absolute encoder home
offset is automatically calculated and updated in the MC Function Module each motion control period.
The updated absolute encoder home offset is automatically saved to the battery-backup memory in the
CPU Unit when the power supply to the Controller is turned OFF. This enables recovering the actual
position of a rotating axis from the absolute encoder the next time power is turned ON even if the power
to the CPU Unit or Servo Drive is turned OFF.
Using an Absolute Encoder in Rotary Mode
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