CiA® 459 series: CANopen profile for on-board weighing devices

On-board weighing and overload protection is used for trucks, off-highway, or off-road vehicles. The CiA 459 series specifies the CANopen interface for such devices. It distinguishes three classes:

  • Class 1: Devices are capable of monitoring the loaded vehicle weight, might be capable of monitoring the loaded axle weight, and provide monitored weighing data.
  • Class 2: Devices are capable of performing non-LFT (legal-for-trade) transaction weighing and provide non-LFT transaction weighing data
  • Class 3: Devices are capable of being fully certified as LFT and of performing LFT transaction weighing. Class 3 devices might additionally support the capabilities provided by class 1 and class 2 devices. The LFT capable device must have at least one alibi component: either alibi memory or an alibi printer.
Block diagram of an on-board weighing system connected via a CANopen gateway compliant to the CiA 413 series

On-board weighing devices with load monitoring capability observe the total vehicle or trailer load and optionally weigh the load on a single axle or a group of axles. Devices supporting non-LFT and LFT transaction weighing store the weighing data optionally in an internal or external data storage device (DSD).

The on-board weighing device might perform load monitoring and transaction weighing at the same time. In  case the on-board weighing devices require switching between load monitoring modes and transaction modes, the switch must be performed via setting the mode in the operating mode object. The on-board weighing device might provide the status of the on-going transaction weighing after it is switched into transaction weighing, depending on the configured PDO mapping. It is highly recommended that transaction weighing data is read from the DSD or alibi memory whilst the device is in the NMT state Pre-operational.

The on-board weighing device uses one or more load cells to measure weight. These sensors can be connected by means of discrete ports or serial interfaces as well as a sub-layered CANopen network.

The CiA 459 series and the CiA 413 series are only available for members. Part 1 provides general specifications and an overview of the functions. Part 2 specifies the communication parameter including PDO mapping. Part 3 defines in detail all process data and application configuration parameter.

Title Details
CiA 459-1 version 1.0.1CANopen profile for on-board weighing devices - Part 1: General specification and functional overview
DescriptionThis document provides general definitions and specifies the data link and the physical layer interface for on-board weighing devices. Additionally, it specifies the CANopen application layer functionality. It also describes the device’s operational principles and defines device classes.
DS510 KiB2022-08-09Login
CiA 459-2 version 1.0.1CANopen profile for on-board weighing devices - Part 2: Communication parameters
DescriptionThis document specifies the mandatory and recommended communication parameters, as well as the parameter sets for the PDO communication.
DS249 KiB2022-08-09Login
CiA 459-3 version 1.0.1CANopen profile for on-board weighing devices - Part 3: Application data objects
DescriptionThis document specifies the application parameters (process, diagnostic, and configuration data) of the on-board weighing devices. It also specifies profile-specific data types.
DS1.0 MiB2022-08-09Login