Relay Extension

The Relay Extension features 14 dry contact relay outputs.

Datasheet Relay Extension

Table of Contents


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

Connect the power supply and Link communication to the Miniserver.

Connect the loads to the relay terminals. For loads exceeding 12A, use a wire cross-section of 2.5mm².

For thermal reasons the total load rating must not exceed 48A (IEC) or 45A (UL).

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.

Wiring examples

Connecting switches and loads


Summary Unit Value Range
Actuator (Relay) 1 Digital 0/1
Actuator (Relay) 2 Digital 0/1
Actuator (Relay) 3 Digital 0/1
Actuator (Relay) 4 Digital 0/1
Actuator (Relay) 5 Digital 0/1
Actuator (Relay) 6 Digital 0/1
Actuator (Relay) 7 Digital 0/1
Actuator (Relay) 8 Digital 0/1
Actuator (Relay) 9 Digital 0/1
Actuator (Relay) 10 Digital 0/1
Actuator (Relay) 11 Digital 0/1
Actuator (Relay) 12 Digital 0/1
Actuator (Relay) 13 Digital 0/1
Actuator (Relay) 14 Digital 0/1

Diagnostic Inputs

Summary Description Unit Value Range
Online Status Relay 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
System temperature Provides the internal device temperature.
This is often the temperature of the CPU or another location in the device.
Temperature Shutdown If the CPU temperature reaches a critical point, the outputs of the device are switched off. This can be due to short-circuits, overloaded switching loads or too high an ambient temperature. 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 Relay Extension

Datasheet Relay

Thermal Shutdown Temperatures