AI Extension

The AI Extension features 4 inputs for analogue voltage signals like 0-10V or digital, as well as 4 analogue inputs for current signals like 0/4-20mA.

The inputs AI1-AI4 for voltage signals operate differentially, each with two terminals for signal and reference potential. The integrated open-wire detection detects interruptions in the measuring circuit.

The inputs AI5-AI8 for current signals work passively, and can be integrated into current loops.

The inputs can also measure negative values with reversed polarity.

All inputs are galvanically isolated from the supply side of the Extension.

Datasheet AI Extension

Table of Contents


The Extension is installed on a DIN rail in a suitable enclosure.

Connect the power supply and the link data lines to the Miniserver.

The lines for voltage signals are connected to the analog inputs AI1 to AI4. The GND (negative pole) of the associated signal is also required at each input.

The analogue inputs AI5 to AI8 are integrated in current loops.

The Extension starts after switching on the power supply, and the status LED will flash orange after a short time when the connection to the Miniserver is established.

Then follow the pairing procedure on the Link Interface.

Connecting Analog Inputs

Connection examples 0-10V

0-10V transmitter with 2 outputs:

Connection examples 4-20mA

Active 4-20mA transmitter:

Passive 4-20mA transmitter:


Summary Unit Value Range
Voltage 1 V
Voltage 2 V
Voltage 3 V
Voltage 4 V
Current 1 mA
Current 2 mA
Current 3 mA
Current 4 mA

Diagnostic Inputs

Summary Description Unit Value Range
Online Status AI Extension Indicates whether the device can be reached by the Miniserver.
Diagnostics for Air devices
Diagnostics for Tree devices
Diagnostics for Extensions
Digital 0/1
Open Wire 1 Digital 0/1
Open Wire 2 Digital 0/1
Open Wire 3 Digital 0/1
Open Wire 4 Digital 0/1


Summary Description Default Value
Serial Number Specifies the serial number of the device.
For Extensions: Enter 'Auto' to automatically pair an extension with unknown serial number.
This can only be used if there is only one Extension of the same type.
Save into the Miniserver, in order to pair the Extension.
Afterwards the program must be loaded from the Miniserver to transfer the actual serial number of the Extension into the program.
Monitor Online Status When selected, you will be notified via System Status or the Mailer if the device is no longer available or goes offline. -

Safety Instructions

Installation must be carried out by a qualified electrician in accordance with the applicable regulations.

This device must be mounted on a DIN rail in an electrical distribution enclosure to ensure protection against contact, water and dust.

This device must not be used as part of safety-critical systems.


Datasheet AI Extension