Industrial Controls Change Management (MOC) Guide

Control changes are high impact even when code diffs are small. Practical MOC protects uptime by forcing clarity on why a change is needed, how it is tested, and who owns outcomes.

When This Becomes a Business Problem

The technical issue usually matters because it starts affecting production discipline: operators lose trust in the system, engineering changes become harder to verify, and maintenance teams spend more time reconstructing context than fixing root causes. For Alberta plants, the fastest improvement path is usually a focused software scope with clear acceptance criteria, not a broad platform replacement.

Common Failure Points

• Emergency changes bypass standard testing too often.
• Approvals are role-based on paper but unclear in practice.
• Post-change verification is ad hoc and incomplete.

Control Strategy

• Define MOC tiers by production and safety consequence.
• Require traceable test evidence for every tier.
• Assign accountable owner for change outcome, not just implementation.

Implementation Steps

• Implement change templates with mandatory risk and rollback fields.
• Automate approval routing and evidence attachment.
• Run 24-hour and 7-day post-change reviews for critical changes.

What a Useful Deliverable Should Include

• A current-state summary that names the affected units, systems, tags, graphics, alarms, and operational constraints.
• A prioritized action list split into quick fixes, engineered changes, and items that need outage or commissioning coordination.
• Test evidence that operations, controls, and maintenance teams can review without guessing what changed.
• A handover package with owner, rollback, monitoring, and follow-up expectations so the work does not become tribal knowledge.

KPIs to Track

• Unauthorized change count
• Change failure rate
• Time to rollback failed changes
• Repeat incident rate after changes

30-60-90 Day Plan

• Day 1-30: codify MOC tiers and update templates.
• Day 31-60: enforce workflow in one critical production area.
• Day 61-90: expand plant-wide and audit compliance.

Related Service Paths