Summary/Issue Description
Sometimes, after a power fail you can encounter an upside-down screen. This error can appear after power-cycling the HMI. All the screens will show upside-down the opposite of how they were programmed.
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Root Cause
Electrical noise causes LCD to display a page abnormally. To prevent this, a noise control measure is required. When installing or wiring devices, make sure that there will be no danger to people and that noise will not interfere with electrical signals.
Solution
To prevent this issue wiring and electrical noise countermeasures are required:
Wiring Routes: Each of the following combinations includes different signal types, properties, or levels. They will cause the signal-to-noise ratio to drop due to factors such as electrical induction. As a general rule when wiring, either use separate cables or separate wiring routes for these items. Future maintenance operations and changes to the system will also be made easier by carefully organizing the wiring from the start:
- Power lines and signal lines
- Input signals and output signals
- Analog signals and digital signals
- High-level signals and low-level signals
- Communications lines and power lines
- DC signals and AC signals
- High-frequency devices (such as Inverters) and signal lines (communications)
Wiring Methods: Observe the following points when wiring power supply and signal cables:
- As much as possible, avoid routing multiple power supply lines through the same duct. If it cannot be avoided, then construct a partition between them in the duct and ground the partition.
- When routing signal cables with different characteristics through the same duct, always keep them separated.
- Power cables and signal cables adversely affect each other. Do not wire them in parallel.
- Noise induction may occur if the NA Unit is installed in a panel that includes high-voltage devices. Wire and install them as far apart as possible.
- Either install the NA Unit a minimum of 200 mm away from high-voltage lines or power lines, or
place the high-voltage lines or power lines in metal tubing and completely ground the metal tubing to 100 Ω or less.
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Grounding: Grounding has the following two purposes:
- Protective Grounding: This is done to ensure safety. It is intended to prevent electrical shock by holding the electrical potential at the grounding potential that is generated by factors such as leakage, induction, or failure.
- Functional Grounding: This is done to protect device and system functions, including prevention of noise from external sources, or prevention of noise from devices or equipment that could have harmful effects on other devices or equipment.
The NA unit has a protective ground terminal and a functional ground terminal
Protective ground 
| Functional ground terminal   |
To resolve this issue can be implemented a system recovery if the NA Unit will not start normally or if you want to initialize the contents of the NA Unit to the default state. When you implement system recovery, all the user data is deleted from the NA Unit, and the system program is overwritten with the newest version. Refer to the following steps for the System Recovery Procedure. Be aware that the System Recovery will delete all the files, so prepare a backup file of the project before continuing with this process, otherwise, the project cannot be recovered. Will be necessary to develop the HMI project:
1. Prepare a formatted SD Memory Card or USB Memory Device.
2. Execute the following file in the Sysmac Studio installation media: Sysmac Studio Software | Omron
System_Studio_installation_media\Utility\NA_RecoverUpdate\NA_RecoverUpdate.exe
3. Specify the root folder on the media you prepared in Step 1 as the extraction location
4. Turn OFF the power supply to the NA Unit,
5. Open the battery cover on the back of the NA Unit and set the DIP switch to the settings shown below. When you finish setting the DIP switch, close the battery cover.
6. Insert the media that you prepared in Step 2 into the NA Unit and turn ON the power supply to the NA Unit.
7. Tap the language to use for system recovery
8. Select the package that you want to install, and then tap the Install Button
9. Tap the Yes Button
10. When the following message is displayed, remove the media from the NA Unit and turn OFF the power supply to the NA Unit.
11. Open the battery cover on the back of the NA Unit and set the DIP switch to the settings shown below. When the setting of the DIP switch is finished, close the battery cover.
12. Once the system recovery is finished, go online with Sysmac Studio and transfer the project again.
IMPORTANT: If all the steps above have been followed and the HMI screen still appears upside-down, please reach out to your Omron representative. A repair request will be needed or might consider purchasing a new HMI unit. This issue could potentially stem from LCD damage caused by a power failure. For further information please contact Omron Technical Support at ia.techsupport@omron.com
Date/Revision History
First Review: 02/07/2025
2nd Review: 02/07/2025 V1.1
Author:
Karla Flores Avila, Technical Support Specialist
References
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