UL Requirements

The installation of IO-Link box modules certified by UL has to meet the following requirements.

Supply voltage

CAUTION

CAUTION!

This UL requirements are valid for all supply voltages of all marked IO-Link box modules.
For the compliance of the UL requirements IO-Link box modules should only be supplied

by a 24 V_DC supply voltage, supplied by an isolating source and protected by means of a fuse (in accordance with UL248), rated maximum 4 Amp, or
by a 24 V_DC power source, that has to satisfy NEC class 2.
A NEC class 2 power supply shall not be connected in series or parallel with another (class 2) power source!

CAUTION

CAUTION!

To meet the UL requirements, IO-Link box modules must not be connected to unlimited power sources.

Networks

CAUTION

CAUTION!

To meet the UL requirements, IO-Link box modules must not be connected to telecommunication networks.

Ambient temperature range

CAUTION

CAUTION!

To meet the UL requirements, IO-Link box modules have to be operated only at an ambient temperature range of -25 °C to +55 °C.

Marking for UL

All IO-Link box modules certified by UL (Underwriters Laboratories) are marked with the following label.