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.

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.

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.