8
Sicherheitshinweise
the Web-IO into the housing. Ensure that no individual wires stand off from leads,
that the lead is fully contained in the clamp and that the screws are tightly fastened.
Fully tighten screws on unused terminals.
The power supply used for the Web-IOs must absolutely ensure safe isolation of
the low-voltage side from the supply mains according to EN60950-1 and must have
“LPS“ designation.
EMC
1
NOTE
Only shielded network cables may be used for connecting the Web-IOs to the net-
work.
In this case the Web-IOs meet the noise immunity limits for industrial applications
and the stricter emissions limits for households and small businesses. Therefore
there are no EMC-related limitations with respect to the usability of the devices in
such environments.
The complete Declarations of Conformity for the devices described in the manual can
be found on the corresponding Internet page at the W&T homepage: http://www.wut.
de.
Batteries
The Web-IO Digital 4.0 contains a 3V lithium-manganese dioxide button battery type
CR1632 for backing up the internal clock. This battery has an expected lifetime of
10 years and must be replaced only by a battery of the same type.
When using the Web-IO Digital 4.0 in a network environment with access to a time
server, the battery is not essential for correct function of the device and can be
removed.
1
CAUTION
The battery may be removed or replaced by an electrotechnical specialist, only.
To remove the battery, open the housing as follows:
