What to do if Omron SYSMAC C28K Controller shows I/O bus error I/O BUS ERR?
If the Omron Controller displays an I/O bus error, it indicates an issue in the bus line between the CPU and Units. You should check the CPU Left/Right selector switch on the Expansion I/O Unit and verify the cable connections between the Units and Racks.
What to do if Omron SYSMAC C28K displays cycle time overrun SCAN TIME OVER?
If your Omron Controller displays a cycle time overrun error (SCAN TIME OVER), it means the watchdog timer has exceeded 100 ms. To resolve this, try to reduce the cycle time if possible.
General| Program Memory | EPROM |
|---|---|
| Data Memory | RAM |
| Operating Temperature | 0 to 55°C |
| Humidity | 10% to 90% RH (non-condensing) |
| Type | Programmable Logic Controller |
| I/O Capacity | 28 points |
| Instruction Execution Time (Basic) | 10 µs (for basic instructions) |
| Timer/Counter | 0.1s to 999.9s |
| Communication Ports | RS-232C |
| Power Supply | 100 to 240 VAC, 50/60 Hz |
| Storage Temperature | -20°C to 75°C |
| Instruction Set | Basic and Special Instructions |
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