I/O bus error
Olası Nedenler
- I/O bus communication with expansion unit failed; unit hardware fault
Çözüm
- Check expansion unit seating; verify power supply to right-side expansion; replace faulty unit
Unit setting error
Olası Nedenler
- Wrong unit configuration in I/O table; DIP switch address conflict
Çözüm
- Run I/O auto-detect; fix unit numbers; regenerate I/O table in CX-Programmer
FINS communication error
Olası Nedenler
- FINS gateway unreachable; node address conflict; wrong network settings
Çözüm
- Verify FINS node address; check Ethernet/serial connections; remove duplicate addresses
Ethernet IP address duplication
Olası Nedenler
- Two devices on network share same IP
Çözüm
- Change PLC IP via Sysmac Studio or rotary switch; use unique static IPs
NX Unit I/O refresh error (NX-series)
Olası Nedenler
- NX I/O unit communication failure; unit power loss
Çözüm
- Check EtherCAT connection to NX I/O; check unit DIN rail power supply; reseat unit
EtherCAT slave disconnected
Olası Nedenler
- Network cable fault; slave unit powered off; topology change
Çözüm
- Check EtherCAT cable ring/line topology; verify slave power; check EtherCAT master settings
CPU configuration inconsistency
Olası Nedenler
- Mismatch between actual hardware and configured I/O table
Çözüm
- Rebuild I/O table; transfer updated configuration from Sysmac Studio
Task execution error (NJ/NX)
Olası Nedenler
- Program task could not complete within allocated period
Çözüm
- Increase task period; optimize heavy tasks; use priority task management
Memory card error (CP/CJ series)
Olası Nedenler
- Incorrect memory card type; card not formatted; read error
Çözüm
- Use Omron-compatible memory card (CF or SD); format in PLC; re-copy program
Sysmac Studio "Cannot connect to controller"
Olası Nedenler
- Wrong IP or COM port in project settings; firewall blocking; USB driver issue
Çözüm
- Verify connection settings; install USB driver; disable Windows firewall for NS Studio
Power supply voltage abnormal
Olası Nedenler
- Incoming 24 V DC supply out of tolerance; power supply failing
Çözüm
- Measure supply voltage at PLC terminals; replace external 24 V DC power supply
SYSMAC BUS/2 error (CJ-series rack)
Olası Nedenler
- Rack communication error; backplane damaged
Çözüm
- Check backplane connections; replace backplane if damaged; check CPU module seating
Special unit error
Olası Nedenler
- Special I/O unit (analog, temperature, etc.) reported internal error
Çözüm
- Read unit error via CX-Programmer; replace faulty special unit
CPU unit hardware fault
Olası Nedenler
- Internal CPU hardware failure; rare but permanent
Çözüm
- Replace CPU unit; restore program from backup
Sequence program syntax error
Olası Nedenler
- Illegal instruction or out-of-range operand in downloaded program
Çözüm
- Re-check program in Sysmac Studio; fix syntax errors; re-download
Safety CPU error (NX-series safety)
Olası Nedenler
- Safety program inconsistency; safety unit communication error
Çözüm
- Refer to NX Safety CPU manual; check safety network connections; validate safety program
Fatal CPU error
Olası Nedenler
- Unrecoverable internal CPU fault
Çözüm
- Replace CPU; contact Omron support; check for firmware update
Overcurrent during constant speed
Olası Nedenler
- Motor overloaded at speed; mechanical jam
Çözüm
- Check mechanical load; increase current limit (b012); check motor sizing
Overcurrent during deceleration
Olası Nedenler
- Deceleration too fast; regenerative energy
Çözüm
- Increase deceleration time (F003); add brake resistor
Overcurrent during acceleration
Olası Nedenler
- Acceleration ramp too steep; starting into loaded motor
Çözüm
- Increase acceleration time (F002); check motor starting conditions