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Understanding Access Levels in Building Management Systems (BMS)

September 1, 2025

When designing or managing a Building Automation System (BAS/BMS), one of the most critical factors is Access Control — who can do what within the system.

✅ A well-structured BMS must support at least six distinct access levels, either individually or in combination, to ensure security, functionality, and accountability.

Here’s a breakdown of the 6 Levels of Access in BMS:
1️⃣ Level 1 – View Data
📊 Basic access to view trends, alarms, and equipment status.
2️⃣ Level 2 – Command
🖱️ Ability to send manual commands like turning ON/OFF fans or pumps.
3️⃣ Level 3 – Operator Overrides
🔧 Temporary changes to control parameters for testing or service.
4️⃣ Level 4 – Database Modification
📝 Edit schedules, setpoints, and alarm thresholds.
5️⃣ Level 5 – Database Configuration
⚙️ Modify control logic, point configurations, or system structure.
6️⃣ Level 6 – Full Admin Access
🔐 Add/modify passwords, user roles, and all above privileges.

🔍 Why this matters?
Proper access control prevents accidental changes, maintains system integrity, and supports compliance and security protocols.

💡 Always ensure that users are granted only the minimum required level to perform their roles effectively.

 

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