EN 50325-4:2002 PDF

Overview

EN 50325-4:2002 defines the CANopen profile of the industrial communications subsystem based on ISO 11898 (CAN) for controller–device interfaces. Published by CENELEC and adopted in national standards (e.g., SIST EN 50325-4:2003), this part of EN 50325 sets particular requirements for interfaces between programmable controllers and I/O-capable devices, specifies normal service/ambient conditions, and lays down constructional and performance requirements for CANopen devices used in industrial automation.

Keywords: EN 50325-4, CANopen, ISO 11898, Controller Area Network, industrial communications, device interfaces

Key topics and requirements

• Scope and intent: Defines CANopen-specific requirements for controller–device communications, device behavior under normal service, and construction/performance expectations.
• Device model: Devices are organized into communication, object dictionary, and application functional units. The object dictionary is the canonical interface between communication and application.
• Object dictionary structure:
  • Uses a 16‑bit index and sub‑index mechanism to access up to 65 536 entries.
  • Index ranges include: static data types (0001–001Fh), complex types (0020–003Fh), communication profile area (1000–1FFFh), standard device profiles (6000–9FFFh), and manufacturer‑specific areas (2000–5FFFh).
  • Supports Multiple Device Modules (up to eight device profile segments) and PDO distribution offsets for segment mapping.
• Communication model:
  • Supports synchronous (e.g., Sync message) and asynchronous transfers.
  • Defines triggering modes, inhibit-time to limit minimum time between transmissions, and relationships: master/slave, client/server, and producer/consumer.
• Service primitives and types: Request, indication, response, confirmation; service types include local, unconfirmed (one‑to‑many), and confirmed (request/response) services.
• Normative and informative annexes: Annexes A and B are normative (data types/encoding and object dictionary); C–E are informative (implementation guidance, diagnostics, bibliography).

Applications and who uses it

• Targeted at industrial automation: programmable controllers, I/O modules, motion controllers, HMIs, sensors, encoders, valves, and closed‑loop controllers.
• Primary users:
  • Control system integrators and automation engineers implementing CANopen networks.
  • Device manufacturers creating CANopen-compliant hardware and firmware.
  • System architects specifying controller–device interfaces and interoperability requirements.
• Practical benefits: ensures interoperable device profiles, predictable behavior under normal service conditions, and consistent network services for real‑time control.

Related standards

• ISO 11898 (Controller Area Network - CAN)
• EN 50325‑1 (general requirements)
• EN 50081‑2, EN 61000‑6‑2, EN 55011 (EMC references)
• EN 61131‑3 (programmable controller programming languages)

This standard is essential when designing, certifying, or integrating CANopen devices to guarantee consistent controller–device interoperability and predictable performance in industrial environments.