ix
General
4 Safety
Instruction book, IQAN- Lx
4
Safety
General
In order to fulfil high safety demands, the Lx module uses a real-time operating system
for fault tolerant embedded systems. The Lx module has an internal watchdog function.
If the watchdog detects any software errors, necessary precautions will be activated.
Polarity reversal
The Lx module is protected against power supply polarity reversal, provided an
external fuse, max 3A (Fast) is being used. Polarity reversal can damage the unit if the
fuse is not used.
CAN-bus interruption
The Lx module has special safety functions if the CAN-bus is interrupted. Each module
checks for any interruptions in the CAN-bus communication. If an error occurs the
master will present a related message on the display. The Lx module will also indicate
the error with an error code ref., see page 9.
Input/ output Protection
All inputs on the Lx module are designed to withstand the maximum specified supply
voltage. The outputs are protected against short circuit. Furthermore, an error on one
input or the output will not influence other inputs.
System Diagnostics
The yellow blinking LED on the module indicates normal status. If there is an error
detected, the master will present a message on the display. The Lx module also
indicates
error status
through the red blinking LED as shown below.
This gives an immediate diagnosis as to the nature of the error that has occurred.
The location of the LED indicators on the IQAN-Lx module.
The green LED indicates power on. The yellow/red LED will be blinking red when an
error has been detected. To get futher information about the error messages, see
Appendix B, on page xxvi
Green, power on LED
Yellow/ red, status LED
