Mitsubishi QX81
Price range: € 27,00 through € 149,00
Mitsubishi repareren bij Cirele is:
• Duidelijke tarieven zonder onverwachte kosten
• Betaling pas na geslaagde reparatie
• Proactieve vervanging van tijdgevoelige onderdelen
• Gedetailleerd test- en reparatierapport wordt verstrekt
• 2 jaar garantie op alle reparaties
• Langdurige ondersteuning tot einde levensduur.
Mitsubishi QX81 – Digital Input Module
The Mitsubishi QX81 is a digital input module from the MELSEC System Q series, designed for high-speed and reliable signal acquisition from field devices such as sensors, switches, and push buttons. It is widely used in industrial automation systems requiring precise digital signal handling.
- Manufacturer: Mitsubishi Electric
- Model: QX81
- Series: MELSEC System Q
- Type: Digital Input Module
- Input Points: 32 points
- Input Voltage: 24 V DC (sink/source input type)
- Input Current: Approx. 7 mA per point
- Response Time: 10 ms (standard, selectable)
- Common Terminal Configuration: 4 points/common
- Isolation: Photocoupler isolation per input
- Connector Type: 40-pin connector (for external wiring)
- Mounting: Base rack installation
- Power Supply: Supplied via PLC backplane
- Dimensions: Approx. 98 x 27.4 x 90 mm (H x W x D)
- Weight: Approx. 150 g
- Operating Temperature: 0°C to +55°C
- Compliance: CE, UL, RoHS
The QX81 module is ideal for capturing fast digital signals with stability and precision, making it a dependable component for automation and machine control systems.
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Common defects
Common defects on a Mitsubishi QX81 are:
Power Supply & Hardware
- No power / PLC not starting
- Blown fuses or power components
- Faulty internal power supply module
- Overheating due to poor cooling or fan failure
- Damaged capacitors or power circuits
Input & Output (I/O) Failures
- Digital inputs not responding
- Analog inputs showing incorrect values
- Digital outputs not switching or stuck
- Burnt or damaged relay / transistor outputs
- I/O modules not recognized or defective
Communication Problems
- No communication with HMI or SCADA
- Network issues (Profibus, Profinet, Modbus, Ethernet/IP, CAN, etc.)
- Serial communication (RS232/RS485) failure
- Fieldbus module malfunction
- Outdated or incompatible firmware causing errors
Memory & Software Issues
- Lost parameters or corrupted programs (EEPROM/Flash failure)
- PLC loses program after power-down
- Firmware corruption or software errors
- Faulty or empty backup battery
- Errors during upload/download of program
CPU & Processing Errors
- PLC freezes or resets unexpectedly
- CPU not responding to commands
- Error messages during startup or runtime
- Watchdog timer faults or internal CPU errors
- Synchronization issues with other modules
Mechanical & Physical Damage
- Broken PCB tracks or connectors
- Corrosion due to moisture or chemicals
- Contamination from dust, oil, or dirt
- Burnt components or discolored boards
- Poor solder joints (dry joints)
Other Failures
- Faulty display or diagnostic LEDs
- Non-functional buttons or keypad
- Expansion modules not detected
- Defective internal clock or timers
- EMI/RFI noise due to damaged filters
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