To Next PageTo Next Page
What causes bus character overrun on Mitsubishi FX3U?
A bus character overrun, where more than 256 bytes are received in RTU mode, can be caused by errors in the Turn Around Delay and Message to Message Delay data registers; D8410-D8411, or D8430-D8431. Also verify that the serial port settings are correct.
What to do if Mitsubishi FX3U Controller data is sent but not received?
If data is being sent but not received, check the status of the "RD" and "SD" indicator LEDs provided in the optional equipment. Additionally, verify the wiring, communication settings, and error statuses of the master and slave stations.
What to do if Mitsubishi Controller data is received but not sent?
If data is received but not sent, check the status of the "RD" and "SD" indicator LEDs provided in the optional equipment. It's also important to verify the wiring, communication settings, and error statuses of the master and slave stations.
How to fix communication if it will not function correctly due to incorrect wiring of Mitsubishi FX3U Controller?
To resolve communication issues caused by incorrect wiring, verify that all communication equipment is correctly wired.
What to do if communication will not function correctly due to insecure connection of Mitsubishi FX3U Controller?
If communication is not functioning correctly due to an insecure connection, verify that the communication equipment is securely connected with the PLC.
How to fix invalid device address in Mitsubishi FX3U?
To resolve an invalid device address error, verify that the MODBUS Device Address Allocation of the Slave is set correctly. Ensure master data is in a valid range for a selected command. Confirm that the master is accessing valid device ranges.
How to resolve bit-level error on Mitsubishi FX3U Controller?
To resolve a bit-level error, such as parity, overrun, or framing errors, check Communication Format data register D8400 or D8420 for errors.
How to resolve invalid hardware setup - failed to detect MODBUS communication adapter on Mitsubishi FX3U Controller?
To resolve an invalid hardware setup where the MODBUS communication adapter is not detected, verify that the MODBUS Special Adapters are being used (FX3U-485ADP-MB, or FX3U-232ADP-MB).
How to resolve using dedicated Inverter communication instructions on the same channel as the MODBUS communication on Mitsubishi FX3U?
To resolve issues from using dedicated Inverter communication instructions on the same channel as MODBUS, verify that none of the dedicated Inverter communication instructions are being used on the same channel as the MODBUS communication. If any of the instructions are being used on the same channel, delete it, and then reboot the PLC's power.
What does data length mismatch mean for Mitsubishi FX3U Controller?
A data length mismatch means the received data does not match the byte count value within the telegram. Verify that the Slave is using MODBUS Serial Communication and that the correct command was received. Also verify that the device count of the command is within the limits of the Slave and Master.
General| Model | FX3U Series |
|---|---|
| Program Memory | 64k steps |
| Execution Speed | 0.065 μs/basic instruction |
| Type | PLC (Programmable Logic Controller) |
| Power Supply | 100-240V AC |
| I/O Points | Up to 384 |
| Communication | USB |
| Expansion | Supported via expansion modules |
| High-Speed Counters | Up to 6 channels |
| Analog Input/Output | Available via expansion modules |
| Temperature Range | 0 to 55°C |
| Programming Language | Ladder Logic, Structured Text |
| Built-in Functions | PID control |
| Humidity | 5 to 95% (non-condensing) |
