2: Overview Of The Cvb; Cvb Module Composition And Features - EKE-Electronics CVB1621A Technical Manual

2: Overview of the CVB

This chapter lists selected specifications of the EKE-Trainnet
highlights some of its features.
The following topics are covered in this chapter:

CVB module composition and features

Selected specifications
Module identification
Module LEDs
2.1 CVB module composition and features
The CVB module is designed to ensure reliable data transmission on board a train.
The following sections present some CVB features intended for this purpose.The CVB
module is the provider of two interfaces (X1 and X2) to a CAN bus running a CAN
protocol. There is a connector in the front panel for each independent interface. The
implementation is realised with two CAN controller chips and a local microprocessor.
There are two models of the CVB module.The difference between the modules is
whether they have bus termination inside the module or they need external bus
termination.
Table 2.1: CVB module types
Module type Difference
CVB1621A Internal bus terminators
CVB2456A Needs external bus terminators
The application (ISaGRAF) in the CPU module supervises the gateway between the
CPU and the CVB module. There is a loadable executable running in the CPU module
through which the application is able to access the raw CAN data. The access can be
direct or through a higher level protocol – for instance CANopen. This makes it quick
and easy for the application to run CAN based protocols.
CVB1621A and CVB2456A Technical Manual, ver. 3.00
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CVB module and
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