Local I/O refers to input and output devices that share a direct connection to the main controller within a short distance, usually within the same control cabinet or very close to it.
Characteristics:
- Proximity: Devices are located near the main controller, limiting installation flexibility.
- Wiring: Direct wiring to the controller can result in cluttered and complex wiring schemes, especially as systems grow.
- Latency: Typically, lower latency due to the short distance and direct connections, but modern networks mitigate this for remote I/O.
- Reliability: High reliability with minimal signal degradation over short distances.
- Maintenance: Easier to maintain in smaller systems since all devices are in a centralized area, but this can become cumbersome as systems scale.
- Cost: Lower initial cost for smaller systems. These savings diminish as system size increases and wiring requirements become more complex.
For more information, see our article What is Remote IO?