Overview
EN 60870-6-503:2014 (IEC 60870-6-503:2014) defines the TASE.2 services and protocol for telecontrol equipment and systems. It specifies a method for exchanging time‑critical control‑centre data over wide‑area and local‑area networks using a full ISO‑compliant protocol stack (mapping TASE.2 onto MMS/ISO/ITU‑T). The standard supports both centralized and distributed architectures and covers real‑time data, control operations, time‑series data, scheduling, accounting, remote program control and event notification.
Key topics and technical requirements
- TASE.2 object model: formalizes objects such as Associations, Bilateral Tables, Data Value objects, Data Sets, Transfer Sets, Devices, Programs, Event Enrollments and Event Conditions.
- Services and operations: defines service semantics for data exchange, control, transfer management and event reporting; maps TASE.2 operations onto MMS (ISO 9506) services.
- Network and architecture: designed for use over wide‑area and local‑area networks using a full ISO/ITU‑T stack; supports both centralized control centres and distributed virtual control centres.
- Real‑time and time‑series support: includes mechanisms for real‑time indications, scheduled transfers and time‑stamped series data.
- Access control and bilateral agreements: defines bilateral tables and access control specifications to manage inter‑entity permissions.
- Conformance and scope changes: this 2014 edition makes certain objects and associated services informative and places some TASE.2 conformance blocks out‑of‑scope (see normative text for details).
- Security considerations: interoperates with related security guidance such as IEC/TS 62351‑4 (MMS profiles) for protecting telecontrol communications.
Applications and practical value
EN 60870‑6‑503 (TASE.2) is widely used for inter‑control‑centre communications and enterprise‑scale telecontrol in power systems and utilities:
- SCADA and Energy Management Systems (EMS) integration
- Inter‑utility data exchange (interruptible control, scheduling, settlements)
- Remote program control and device management across wide areas
- Time‑series and historical data transfer for market and operational analysis
- Event notification and synchronization between control centres
Who uses it:
- Utility engineers and control‑centre operators
- SCADA/EMS vendors and system integrators
- Communications and network architects for power systems
- Test labs and conformance assessors
- Cybersecurity teams implementing MMS/IEC 62351 protections
Related standards
- IEC 60870‑6‑702 (Functional profile for TASE.2 in end systems)
- IEC 60870‑6‑802 (TASE.2 Object models)
- IEC 61970 series (CIM / EMS‑API)
- ISO 9506‑1/2 (MMS - Manufacturing Message Specification)
- IEC/TS 62351‑4 (Data and communications security profiles for MMS)
This standard is essential for anyone implementing robust, ISO‑aligned telecontrol protocols (TASE.2) for large‑scale energy and utility communications.