The CANopen application profiles CiA 423 and CiA 430 specify the CANopen interfaces of functionalities that may be required for controlling the diesel engine and the accompanying auxiliary units for e.g., power train cooling or pre-heating. The different virtual devices, which are defined in the document CiA 423, are illustrated in the Figure. The diesel engine control unit operates the diesel engine according to the commands received by the traction controller. The CANopen profile offers the possibility to control the diesel engine by means of a speed-, power-, or torque demand-value. The diesel engine sensor unit provides the sensor values, which are required for a safe and correct engine operation. All measured analog values such as engine oil pressure, charge air temperature, coolant level, etc. are represented in a harmonized data format, in data type signed Integer 32. This offers the possibility to represent all analog values with the same SI-unit in the same resolution without further offset calculation. In addition the CANopen application profile defines virtual devices for transmission control, particle filter control, oil refill unit control as well as vehicle speed control. For more detailed information CiA members can access CiA 423 specification in CiA's members-only section of the website.