User manual

Conguration | Order and arrangement of the modules
19Manual u-remote1432790000/03/02.2014
4 Conguration
4.1 Order and arrangement of the modules
The u-remote system elements are designed to be installed
on a prole rail according to EN 60715 (35 × 7.5mm),
asteel strip in accordance with Annex A of EN 60715, or
atin-plated steel strip.
A u-remote station may be built up to a
maximum length of 1m. Therefore at most
82modules can be aligned on a coupler.
The u-remote station is usually installed on a horizontally
positioned DIN rail.
42 mm
1.65"
42 mm
1.65"
Installation position of the u-remote station on the DIN rail (horizontal installation)
Installation on vertically positioned DIN rails is also possible.
In this case however, the heat dissipation is reduced such
that the derating values change (seeSection 4.5).
In the case of vertical mounting, the eld-bus coupler must
always be arranged as the rst module at the bottom and
secured with a MEW35/1 end bracket for vertical mounting
(Order No. 1805610000).
42 mm 42 mm
1.65" 1.65"
Installation position of the u-remote station on the DIN rail
(vertical installation)
A u-remote station may only be installed in this sequence
(starting from the left/bottom):
– End bracket
– Bus coupler
– Up to 82 modules (including max. 64 active modules)
– End plate and end bracket
ATTENTION
A maximum of three passive modules (potential distribu-
tion module, power-feed module or blank module) may be
placed in successive positions. Then at least one active
module must follow.
Arrangement of SIL modules
A UR20-PF-O SIL module can be positioned anywhere in the
u-remote station. All of the following output modules (except
for the UR20-4RO-CO-255 and UR20-4RO-SSR-255 relay
modules) up to the next PF-O module are safely disconnect-
ed (safety segment). Multiple UR20-PF-O SIL modules/safety
segments can be arranged within a station.
When using u-remote PF-O-xDI-SIL modules,
please also observe the Module for Func-
tional Safety Manual.
The manual is available to download from the
Weidmüller website.