PLC Repair Singapore — Programmable Logic Controller Repair
Your PLC is the brain of your automation system. A faulty CPU, failed I/O module or corrupted program can shut down an entire production line in minutes. QC Engineering provides fast, professional PLC repair with a No Fix, No Fee commitment.
Our engineers diagnose faults at component level across all major PLC platforms — restoring your controller and backing up your program data as standard practice.
Common PLC Fault Symptoms
- PLC fails to power on or trips immediately
- CPU in STOP mode — will not go to RUN
- Program lost after power failure (battery fault)
- I/O channels not reading or outputting correctly
- Communication error with HMI, SCADA or field devices
- Intermittent faults causing random machine stoppages
- Error LEDs lit — SF, BF, INTF, EXTF
- Rack slot errors — module not recognised
Service Levels
| Repair Type | Description |
|---|---|
|
Standard Service |
14-day turnaround — includes program backup and functional test. |
|
Express Service |
3-day turnaround — subject to T&Cs and parts availability. |
|
No Fix, No Fee |
No charge if we cannot repair your PLC module. |
Brands We Repair
| Brands | ||
|---|---|---|
|
Siemens (S7-200, S7-300, S7-400, S7-1200, S7-1500) |
Mitsubishi (MELSEC Q, A, FX) |
Omron (CJ, CS, NJ, CP) |
|
GE Fanuc (90-30, 90-70, VersaMax) |
ABB (AC500) |
Honeywell (FC300) |
|
Schneider (Modicon M340, M580) |
|
|
VFD / VSD Repair Services
| Repair Type | Description |
|---|---|
 CPU Module Repair |
Diagnose and repair failed CPU modules — addressing processor faults, EPROM/flash errors, RAM failures and battery-backed memory issues. |
 Power Supply Module Repair |
Repair or replace PLC power supply modules that are outputting incorrect voltages, overheating or failing to power on. |
 Digital I/O Module Repair |
Repair digital input and output modules with failed channels — transistor output failures, optocoupler damage, blown protection circuits. |
|
Analogue I/O Module Repair |
Restore analogue input and output modules affected by signal drift, channel failure or damage from electrical transients. |
 Communication / Network Card Repair |
Repair PROFIBUS, Modbus, Ethernet/IP, DeviceNet and industrial Ethernet interface modules. |
 Program Backup & Upload |
Back up your PLC program to PC before repair and restore it precisely afterwards — no loss of ladder logic, function blocks or data blocks. |
 Battery & Memory Module Replacement |
Replace depleted backup batteries and failed SRAM memory modules that cause program loss on power cycling. |
 Rack / Backplane Repair |
Repair backplane faults — bad slots causing communication errors between modules in the rack. |
|
Programmer Device Repair |
Repair hand-held programmer units and industrial PCs used for PLC programming and monitoring. |
 High-Speed Counter & Positioning Module |
Repair specialist motion and counting modules used in encoder feedback, axis positioning and high-frequency input applications. |
