HMIST6500 may continue logging normally while you discover that its USB log files cannot be collected live. That is not a storage-capacity fault: the terminal supports external USB storage up to 2 TB in FAT format, but log retrieval is an offline operation. Stop or suspend the logging workflow, export the data to CSV or TXT, verify the exported file, and then return logging to service.
Read the panel symptom first
Start here. Separate a logging failure from a file-retrieval limitation. If records continue accumulating but you cannot copy the active log from the USB device, changing storage capacity will not remove the restriction.
| Symptom | Most likely cause or next check |
|---|---|
| Logging runs, but the active file cannot be collected | Live collection is not the supported workflow. Take logging offline and export first. |
| The USB device is not recognized | Check that capacity does not exceed 2 TB and that the device uses FAT format. |
| An exported file exists but lacks recent records | The active data may not have been closed or committed before export. Repeat the offline sequence. |
| The exported file is present but cannot be analyzed | Confirm the selected output is CSV or TXT, then inspect the file on another system. |
| Logging does not resume after collection | Restore the configured logging state and confirm that new records are being written. |
Do not begin by replacing the HMI, rebuilding every logging tag, or increasing USB capacity. Those actions waste time when logging itself works and only file collection is blocked.
Separate active logging from exported data
The HMIST6500 logging store and the exported file serve different purposes. The active store belongs to the running logging process. The CSV or TXT file is the transferable result created by an export operation.
Active log files can remain open while samples are buffered, indexed, or appended. Copying or removing storage during that state can produce an incomplete file or interrupt writes. The supported collection path therefore creates a separate export while the logging workflow is offline.
“Offline” is the deciding constraint. Do not plan a maintenance process that depends on copying log files from the USB device while data logging continues. If uninterrupted historical coverage is required, treat the export interval as planned downtime and account for the gap in the operating procedure.
EOTE configures the logging project, but project configuration does not turn the USB device into a live shared drive. A larger device changes retention capacity; it does not change file ownership or the offline export requirement.
Check the USB device before changing the project
Check the media first when the terminal does not recognize the device or cannot write to it. Use these two acceptance conditions:
- Capacity is no greater than 2 TB.
- The storage is formatted as FAT.
The stated requirement is FAT. Do not silently substitute NTFS or exFAT because a workstation can read those formats. If a formatting utility offers several FAT variants, select the variant specified by the HMIST6500 project documentation or the device-formatting workflow; the installation information does not identify a narrower FAT variant.
Capacity and format answer only whether the medium is eligible. Also perform ordinary field checks: confirm that the terminal detects the device, verify that the configured log destination is the external device, and check that a test record can be written. Read remaining space from the terminal or another system before a planned export. Do not infer a retention period from the 2 TB ceiling; retention depends on record size, logging frequency, and the number of logged values.
Export the log with logging offline
Use a controlled collection window. Do not remove the USB device while the active logging process owns it.
- Confirm that the HMIST6500 is currently logging and note the timestamp or last visible record that should appear in the export.
- Place the logging workflow offline using the controls defined in the EOTE project. If the project has no operator control for this action, use the approved maintenance method for that application.
- Wait for the interface to show that logging has stopped or is no longer updating. Do not use an invented delay; use the actual status indication or verify that the record count has stopped changing.
- Run the configured export operation and select
CSVorTXTas required by the downstream system. - Confirm that the export completes before accessing or removing the USB storage.
- Open the exported file on the intended analysis system. Check that the first and last records, timestamps, delimiters, and logged fields are present.
- Return the USB device to the terminal if it was removed, restore logging, and confirm that new records are being added.
If production cannot tolerate a logging interruption, stop at the planning stage. Changing file extensions, adding free capacity, or trying another USB device will not convert the offline export into a live-copy function.
Verify both the export and the restart
A file name alone does not prove a successful collection. Validate the contents before leaving the machine.
- Compare the last exported timestamp with the time noted before logging went offline.
- Check that the expected columns or text fields exist and contain plausible values.
- Look for a truncated final row, an empty file, or a sudden timestamp gap.
- Record the export time and the period during which logging was offline.
- After restart, generate or observe a known process change and confirm that a new record captures it.
Keep export verification separate from restart verification. A correct historical file does not prove that logging resumed, and a newly updating log does not prove that the exported file contains the final pre-stop records.
Avoid recurring collection mistakes
Do not treat the 2 TB value as a target size. It is the maximum supported capacity, not a requirement. Select media within that limit and manage free space according to the project’s actual data rate.
Do not reformat a device that contains the only copy of production data. Copy required files elsewhere before any formatting work. After formatting, test recognition, write operation, offline export, file readability, and logging restart before returning the system to production.
Do not remove storage merely because the screen appears idle. Logging can continue without a visible screen change. Use the configured logging state or a changing record indicator to decide whether the writer has stopped.
Do not rename an active internal file to CSV or TXT. The export operation creates the transferable representation; changing an extension does not convert file structure or flush pending records.
FAQ
Why does HMIST6500 reject my USB storage?
Check capacity and format first. The supported maximum is 2 TB, and the external USB storage must use FAT format.
Why does HMIST6500 require an offline export?
The running logger owns and updates its active data. Collection uses a separate export to CSV or TXT, and that retrieval workflow is available offline rather than while logging continues.
Why is my exported CSV missing the newest records?
Confirm that logging had actually stopped before export and compare the file’s last timestamp with the timestamp noted before shutdown. Repeat the offline export if the final records were not committed.
Why does a larger USB drive not allow live log copying?
Capacity affects storage space, not access mode. Even within the 2 TB limit, log collection still requires taking the logging workflow offline and exporting the data.
When should I stop troubleshooting and contact official support?
Escalate when a FAT-formatted device at or below 2 TB is not detected, the configured offline export repeatedly fails, or logging will not restart after a verified procedure. Provide the HMIST6500 project details, EOTE configuration, storage capacity and format, observed status indications, and a repeatable sequence to the manufacturer’s official support channel.