Omron NX-series User Manual page 52

3 Management Functions for NX Units
Display for Units That Do Not Support Monitoring the Total Power-
ON Time
If a Unit does not support monitoring the total power-ON time, the total power-ON time for the Unit is
displayed as "---" on the Sysmac Studio.
Display When Reading the Time Failed
If reading the time failed, the total power-ON time is displayed as "---" on the Sysmac Studio.
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NX-series Communication Control Unit Built-in Function User's Manual (Z396)