Issue
- The MNB-Vx appears in the Workplace Commissioning Tool in a read-only mode.
- After downloading a MNB-Vx controller, an error window appears stating "The download was completed but the application was invalid. The device is now running the factory default application".
Product Line
TAC IA Series
Environment
- MNB-Vx
- Workplace Commissioning Tool
Cause
This condition is related to improper AC power provided to the MNB controller. Typically, when AC power drops below 20 Vac, the controller will fall back to a factory-installed application and switch to read-only mode in the Workplace Commissioning Tool.
Resolution
- Fix the AC power supply so that it is within specifications for the MNB controller.
- Do a hardware reset using the dip switches to get it out of read only mode.
- Try the download again.