User manual

4 Conguration | Order and arrangement of the modules
19Manual u-remote1432790000/08/12.2015
4 Conguration
4.1 Order and arrangement of the modules
The u-remote station is designed to be installed on a DINrail
(35 × 7.5mm or 35 x 15mm) made from steel or galvanised
steel according to EN 60715.
A u-remote station may be built up to a
maximum length of 1m. Therefore at most
82modules (including max. 64 active mod-
ules) 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 eldbus 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 safe power-feed modules
A safe power-feed module PF-O-xDI-SIL module can be
positioned anywhere in the u-remote station. All of the fol-
lowing output modules (except for the UR20-4RO-CO-255
and UR20-4RO-SSR-255 relay modules) up to the next PF-O
module will be safely disconnected (safety segment). Mul-
tiple PF-O-xDI-SIL modules/safety segments can be arranged
within a station.
When using safe power-feed modules, please
also observe the Module for Functional
Safety Manual.
The manual is available to download from the
Weidmüller website.