Mitsubishi Electric MELSEC iQ-F FX5 - 20.3 Procedure for Memory Dump; 20.4 Flow of Data Collection; Effect on the scan time

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20 MEMORY DUMP FUNCTION
20.3 Procedure for Memory Dump
20.3 Procedure for Memory Dump
This section describes the procedure for memory dump. Note that each operation of the memory dump function is performed
with the engineering tool.
[Debug]  [Memory Dump]
For how to view and operate the window, refer to the following.
GX Works3 Operating Manual
1. Configure the memory dump settings by the menu operation in the engineering tool.
2. Writing the memory dump setting file results in a wait state for the trigger. Whether the CPU module is in a RUN state,
STOP state (including stop error
*1
), or PAUSE state, a wait state for the trigger results.
*1 Limited to where the trigger condition is device specification.
• If the memory dump setting file is stored, the memory dump will be executed when the CPU module power
is turned OFFON or reset.
• The engineering tool allows the memory dump status to be checked.
3. Establishment of the trigger condition initiates data collection, saving the memory dump file to the SD memory card.
4. The contents of the memory dump file (collected device data) can be checked with the engineering tool.
20.4 Flow of Data Collection
Collected data is stored in the internal buffer, where the data is partitioned at END processing and saved in the SD memory
card. When a trigger is generated, the END process will take longer than usual.
Precautions
• If a user interrupt occurs while transferring the device data to the internal buffer, a data inconsistency will occur.
• If a user interrupt occurs while transferring double-word devices, an inconsistency will occur in the high-order and low-order
word devices.
Effect on the scan time
If the memory dump function detects a trigger, the scan time will increase as follows when collecting the data.
• FX5UJ CPU module: Approx. 25ms
• FX5U/FX5UC CPU module: Approx. 15ms (Approx. 16ms if SFC program exists)
Program
Condition establishment
timing
Internal buffer
SD memory card
Program END
processing
Condition establishment
Trigger
occurrence
Writing of sampling data
Finish