Mechanical design of Rack I/O

The Freelance 800F Rack modules have a mechanical

design similar to that used in programmable logic

controllers. Its front panel connection method makes

it exceptionally easy to assemble and to service, also

allowing it to be mounted on the wall.

Freelance 800F Rack modules are inserted into racks

from the front and secured in position with screws.

Each is contained within a metal enclosure providing

exceptional mechanical ruggedness and electromag

netic immunity.

All casing materials used are simply screwed togeth

er, allowing them to be separated for future recycling.

Last but not least, the Freelance hardware compo

nents have taken environmental protection into ac

count by using a minimal amount of paint. The mod

ules have no jumpers or switches whatsoever on the

printed circuit boards, meaning that the user does

not need to open the cartridges. No potentiometers

have been used either.

The Freelance Rack I/O is designed to operate in

ambient conditions of 0 to 50° C (32 to 122 °F) with

out forced cooling. A temperature sensor within the

cartridge monitors the temperature of the module

and triggers an alarm when the maximum value

permitted is exceeded.

Quality and electromagnetic compatibility

By using a well-shielded metal case for each module

and also installing EMC filters in each incoming and

outgoing lead, measures have been adopted to

comply with EMC standards without the need of

installation in cubicles. As a result, the Freelance

800F hardware meets the binding EMC standards

and bears the CE Mark. The requirements of IEC 801

and the NAMUR industrial standard have also been

fulfilled. A sophisticated test strategy, the installation

of optical inspection systems, and integrated self-test

functions ensure that the modules are highly reliable.