# What is a PSIM? > A Physical Security Information Management system (PSIM) is a software platform that aggregates data from multiple, disparate security subsystems — video surveillance, access control, intruder alarms, Canonical URL: https://safetyscope.eu/glossary/what-is-psim _Published: 2025-12-03 · Updated: 2026-04-02_ A Physical Security Information Management system (PSIM) is a software platform that aggregates data from multiple, disparate security subsystems — video surveillance, access control, intruder alarms, fire detection — into a single unified operator interface and applies correlation rules to surface compound incidents. Think of a PSIM as the brain that sits above every individual security system: it does not replace them, it connects and coordinates them. For organisations managing large or multi-site security estates, a PSIM is the difference between an operator juggling ten separate screens and an operator working from one coherent picture. ## How a PSIM works A PSIM operates as an integration and orchestration layer. It ingests event feeds from every connected security subsystem — [access control](/integrations/ai-video-analytics-access-control) transactions, [video analytics](/glossary/video-analytics-software) alerts, alarm panel triggers, intercom activations — and normalises them into a common event format. Once events are normalised, correlation rules analyse them in combination. A single door-forced alarm might be routine; a door-forced alarm combined with a person detected by AI video analytics in a restricted zone at 2 AM becomes a high-priority compound incident. This correlation logic is what separates a PSIM from a simple dashboard or a [video management system](/glossary/video-management-software-vms). When a correlated event triggers an alert, the PSIM presents the operator with a predefined response workflow: verify on camera, notify the guard, lock adjacent doors, log the action. Every step is recorded for audit. The operator follows a consistent procedure regardless of which subsystem originated the event. The analogy from cybersecurity is useful: a PSIM is to physical security what a SIEM (Security Information and Event Management) is to IT security — it aggregates signals from many sources, correlates them, and drives a structured response. ## Why a PSIM matters for physical security operations Large organisations often accumulate security systems over years — an access control system from one vendor, cameras from another, intruder alarms from a third. Without a PSIM, operators manage each system through its own interface, context-switching constantly and relying on memory to correlate events across platforms. The consequences are predictable: slower response times, missed compound incidents, inconsistent response procedures across sites, and an inability to produce a unified audit trail. A PSIM addresses all four problems by consolidating the operator experience and enforcing standardised workflows. For multi-site operations, the value compounds further. A PSIM allows a central [security operations centre](/glossary/security-operations-centre-soc) to monitor dozens of sites through a single platform, applying consistent detection and response logic across every location. ## Key capabilities of a PSIM ### Event correlation The defining capability. A PSIM combines signals from multiple subsystems to identify compound incidents that no single system would flag on its own. A door held open is a maintenance issue; a door held open while a person runs through a perimeter zone is a security incident. Correlation rules encode this logic. ### Unified operator interface A single screen presenting all security domains — video, access, alarms, intercoms — with contextual information pulled together around each event. The operator sees the relevant camera feed, the access log, and the alarm state in one view, not across three separate applications. ### Response workflow automation Predefined standard operating procedures triggered by event type. When an intrusion alert fires, the PSIM can automatically bring up the nearest camera, notify the response team, lock adjacent doors, and present the operator with a checklist. This reduces response time and eliminates procedural variation between operators. ### Audit and reporting Every event, every operator action, and every response step is logged with timestamps. This provides a complete audit trail for compliance, post-incident review, and regulatory reporting — something that is extremely difficult to reconstruct from separate system logs. ## PSIM and SafetyScope SafetyScope's AI video analytics platform feeds structured, classified events — person detected, vehicle in restricted zone, loitering alert — directly into PSIM platforms via standard integration protocols. This means the PSIM receives not just raw motion alerts but contextualised, AI-verified events with object classification and confidence scores, significantly improving the quality of correlation logic and reducing [false alarm](/glossary/false-positive-security-cameras) escalation. For a detailed walkthrough of how this integration works, see the AI video analytics and [PSIM integration](/integrations/ai-video-analytics-psim-integration) guide. ## FAQ ### What is a PSIM in physical security? A PSIM (Physical Security Information Management) system is a software platform that integrates data from multiple security subsystems — video, access control, alarms, fire — into a single operator interface, correlating events to surface compound incidents and automate response workflows. ### What is the difference between a PSIM and a VMS? A VMS manages video cameras — recording, playback, and live viewing. A PSIM sits above the VMS and integrates video with other security systems (access control, alarms, fire), correlating events across all domains. A VMS is one of several subsystems that feed into a PSIM. ### What systems does a PSIM integrate with? A PSIM typically integrates with video management systems, access control platforms, intruder alarm panels, fire detection systems, intercom and PA systems, perimeter detection sensors, and increasingly, AI video analytics platforms. ### Does a PSIM replace existing security systems? No. A PSIM sits above existing systems as an integration and orchestration layer. It connects and coordinates them but does not replace the underlying VMS, access control, or alarm systems. ### How does AI video analytics connect to a PSIM? AI video analytics platforms send structured event data — object detections, classifications, and alerts — to the PSIM via standard protocols. The PSIM can then correlate these AI-generated events with data from other subsystems to create compound incident alerts.