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4 CAN I/O Support

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Detecting Timeouts When Receiving CAN Messages

The Receive driver blocks for all CAN boards allow to output the timestamp at

which the latest corresponding CAN message has been received. This

information can be used to detect if another CAN node is still alive and

therefore is sending CAN messages or is no longer alive and special action has

to be taken. Assume that we expect a CAN message from another CAN node

every 2 ms. If no new message is received within 10 ms the other CAN node is

being considered faulty and the Simulink model (target application) has to

proceed accordingly.

The CAN blockset in the xPC Target I/O block library provides a utility block

called CAN Timeout Detection. This is a simple graphical subsystem (inspect

it by looking under it’s mask) which uses the timestamp information to

calculate the timeout condition.

A Simulink model using this block in conjunction with a Receive block could

look as follows.

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MATLAB XPC TARGET 4 - DEVICE DRIVERS Specifiche Pagina 138

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