467
2020/09
14 Mounting and Wiring
14.1 Mechanical mounting
14.1.1 General mounting rules
Keep space to the left of the gateway free for the first end bracket. This end bracket can be
mounted first (before the gateway) or after having mounted the complete station.
The gateway is the first electronics component on a BL20 station.
If a gateway with integrated power supply unit is used, (BL20-GWBR-…),
the I/O-modules are mounted subsequently in the order required directly following the gateway.
When using a gateway without integrated power supply unit, the second component is a Bus
Refreshing module, which provides the gateway with 5 VDC via the module bus. It must be
ensured that the correct base module is used (see module chapters).
Should it become necessary, a potential isolation can be achieved by mounting a Power Feeding
module (power distribution) before mounting the next module.
Power Feeding and Bus Refreshing modules can be mounted between the rest of the modules as
required.
An end plate is mounted at the end of each BL20 station.
The complete BL20 system is secured to the mounting rail by means of two end brackets. The first
is to the left of the gateway, the second is placed at the other end of the system and mounted
together with the end plate.
Mounting rail
The mounting rails used for BL20 should be mounted onto a galvanized mounting plate with a min-
imum thickness of 2 mm / 0.08 inch. This allows a reference potential for protective earth (PE) and
functional earth to be created. Please allow for a maximum distance of 150 mm / 5.91 inch between
mounting holes, when mounting non pre-drilled mounting rails.
DANGER
Open electrical contacts
Danger to life due to electric shock when using 120/230 V
† Cover open contacts at the end of every station using an end plate.
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