Beckhoff Knowledge Base: Communication with an ekey finger scanner

Teaching in a finger

In order to teach in a finger, the finger must be given a User ID and a Finger ID. The maximum number of fingers that can be saved in the finger scanner depends on the respective model.

Normal enrollment

The User ID is specified at the byUserID input and the Finger ID at the byFingerID input of the FB_EKEY_FingerScanner. The finger scanner is placed in teach-in mode by a rising edge on the bNewFinger input and the status LED begins to light orange.

Teaching in a finger 1:

A finger can now be read in. Please observe the correct finger position when drawing it over the scanner (see documentation for the finger scanner). If the finger has been read in correctly, the status LED changes to green and the finger scanner reverts automatically from teach-in mode to normal mode.

Teaching in a finger 2:

If the finger was not identified correctly, the status LED changes to red and the process is repeated. The finger must then be drawn over the finger scanner again. Please start only when the LED lights up orange again.

Teaching in a finger 3:

The finger scanner switches automatically back to normal mode after approximately 10 seconds if there is no activity in teach-in mode.

Teaching in a finger 4:

Description of the LEDs

Description LED function Status LED left Status LED right
waiting for finger orange off off
Extraction orange (flashing) off off
Enrollment OK green (2 sec.) off off
Enrollment not OK red (2 sec.) off off

Triple enrollment

The process is the same as in Normal enrollment, except that the steps are carried out three times in total.

Description of the LEDs

Description LED function Status LED left Status LED right
waiting for finger orange off off
Extraction orange (flashing) off off
Extraction OK green (1 sec.) off off
Quality poor - retrying orange red off
2nd pass
waiting for finger orange off off
Extraction orange (flashing) off off
Extraction OK green (1 sec.) off off
Quality poor - retrying orange red off
3rd pass
waiting for finger orange off off
Extraction orange (flashing) off off
Extraction OK green (1 sec.) off off
Quality poor - retrying orange red off
Quality good – enrollment OK green (2 sec.) green (2 sec.) green (2 sec.)