Operation When A Momentary Power Failure Occurs; Considerations - Mitsubishi Electric MELSEC iQ-R Series User Manual

Operation when a momentary power failure occurs

The following explains the operation when a momentary power failure occurs.
When a momentary power failure within the allowable time is detected
• The values in the buffer memory are retained when a momentary power failure occurs.
• After the power is restored, error information is registered in the event history. (At the first detection)
• The number of momentary power failures is retained in the special register (SD53).
When a momentary power failure longer than the allowable time is detected
This product operates in the same manner as when the following operations are performed:
• Turning the power of this product OFF and ON
• Resetting the hardware by using the HARD RESET/OS RESET switch

Considerations

The following shows the considerations for operating the product.
Operation when temperature becomes high
The primary CFast card of this product has the thermal throttling function to protect itself from heat.
The thermal throttling function is enabled when the internal temperature of a primary CFast card exceeds 70, and limits the
speed for accessing the primary CFast card.
If this function is enabled, it remains enabled until the internal temperature of the primary CFast card drops below 50.
Operation when the CPU usage rate on Windows is high
If this product is used while the CPU usage rate on Windows is high, the following processing may not run properly.
• User program using a library provided by this product
• Access from an external device via Ethernet
If a timeout occurs in a user program or external device, take the following corrective actions:
• Increase the timeout time.
• Reduce the CPU usage rate on Windows.
• Terminate an unnecessary process.
Operation when Windows Update runs
The processing load on Windows becomes high while downloading Windows Update data and updating Windows by using
the downloaded data. Therefore, this product may not operate normally.
In this case, perform the operation again after Windows Update is completed.
2 SPECIFICATIONS
2.2 Operational Specifications
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