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2.4. Control LEDs<br />

The CAN module has a series of control LEDs. They are used for easy visual<br />

indication of various state functions.<br />

While switching-on the module in DIP-switch mode oder software mode, the<br />

module should signalize the following sequence:<br />

all five LEDs flashing briefly<br />

right LED (I/O access) flashing briefly<br />

In ”special mode”, the following signal sequence should be seen:<br />

all five LEDs flashing briefly<br />

right LED (I/O access) flashing briefly<br />

all five LEDs flashing briefly<br />

2.4.1. Definition of LEDs<br />

LED Description<br />

3,3V Internal 3,3V power supply<br />

5V Internal 5V power supply<br />

Interface Active communication- over the CAN bus<br />

Activity<br />

ERROR Error during CAN-transfer (for details see document ”CAN<br />

protocol”)<br />

Inputs: Change State change between 2 read-out cylces detected<br />

Outputs: Auto-Due<br />

to timeout, all outputs are switched-off for safety reasons<br />

Off<br />

I/O Access CPU-access on the inputs and outputs of the connected<br />

modules<br />

Hardware description |Seite 12

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