User manual

Table Of Contents
Hardware description |
Seite 53
2.4.1.4. Control LEDs
The USB module has a series of control LEDs. They are used for easy visual
indication of various state functions.
While switching-on the module, it should signalize the following sequence:
all five LEDs flashing briefly
right LED (I/O access) flashing briefly
all five LEDs flashing briefly
2.4.1.4.1. Definition of the LEDs
LED
Description
3,3V
Internal 3,3V power supply
5V
Internal 5V power supply
Interface
Activity
Active communication- over the USB bus
ERROR
Error during USB-transfer (for details see document USB
protocol”)
Inputs:
Change
State change between 2 read-out cylces detected
Outputs:
Auto-Off
Due to timeout, all outputs are switched-off for safety
reasons
I/O Access
CPU-access on the inputs and outputs of the connected
modules