FP∑ Positioning Unit Precautions Concerning the Operation and Programs
14-3
14.1 Precautions Relating to Basic Operations of the Unit
14.1.1 Values of Shared Memory are Cleared When Power is Turned OFF
The data in the shared memory of the positioning unit is not backed up if a power failure occurs. As a
result, when the power supply is turned ON again, the default operation data should be written to the
shared memory before the various start flags are turned ON.
When the power supply is turned OFF, the various set values in the shared memory are set to “0”. All of
the control codes also return to the default values.
Note:
If the start flags are turned ON without writing the data to the memory, a set value error may occur, and
the unit may not operate as expected.
If a home return is carried out when the power supply is ON, write the control codes to the memory
before the home return start flag is turned ON. If the control codes are not written to the memory,
problems may occur such as a discrepancy between the direction of the home return and the input logic,
causing the unit to operate in unexpected ways.
Reference:
The following program should be written to the unit, so that after the power supply is turned ON, the
elapsed value data prior to the power supply being turned OFF will be read.
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