Siebert S102 Série Manuel D'utilisation page 25

Status indicators
The status indicators (LEDs) on the back of the unit have the following function:
PWR The Profibus interface is supplied with power.
BUS The unit is parameterized on the bus and recognized as participant.
DATA Short flashing: The information to be displayed is being updated.
Control
The units must be parameterized before they can be controlled. Parameterization
occurs in a menu (see 'Parameterization').
In menu item 1, choose whether the data is to be interpreted as unsigned Integer,
signed Integer, in 16-bit or 24-bit mode or as ASCII codes.
Warning
In Profibus-systems bus errors can cause damage to personal or material
property. Please bear in mind, that activating the menu while operating
Profibus units may cause a bus error.
BAL S102 PFB M 1.0 25