Learning outcomes
- Explain the key principles of remote i/o and redundancy.
- Carry out a structured practical check or configuration task.
- Recognise common faults, risks and evidence needed for diagnosis.
Module 6 · Lesson 4
Remote I/O and redundancy
Design remote I/O, redundant controllers, networks and power supplies for availability and maintainability.
Before you begin
Architecture diagram and failure-mode review.
Safety: Use site procedures, approved test equipment and competent supervision. Never bypass a protection or interlock without formal control.
Step-by-step learning
- Identify each single point of failure.
- Define controller, network, power and I/O redundancy behaviour.
- Test switchover without creating unsafe output changes.
- Document degraded modes and operator indications.
Ian's practical tips:
- Redundancy that has never been tested is only a drawing.
- Keep firmware, configuration and replacement spares compatible.
Fault-finding questions
- What should be happening, and what evidence proves it?
- Where is the last known correct signal, voltage, state or process condition?
- What changed immediately before the fault?
- Can the system be divided into smaller testable sections?
Practical activity
Create a one-page test record for this lesson. Include expected values, measured results, equipment used, risks controlled, defects found and the final proven condition.