Mounting and Wiring
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14.2.1 Dismounting of a single component
Base modules and gateways can only be dismounted after the end plate has been disconnected
from the last base module on the mounting rail. To do this, the end bracket mounted together
with the end plate must be loosened.
The gateway can only be dismounted from a station after all the base modules located on its
right are separated and moved away to the right along the mounting rail. Furthermore, all con-
nections from the gateway to the fieldbus must be disconnected. All wires must be disconnected
and the fieldbus must be switched off.
Individual base modules can only be removed from a station when all base modules located to
its right have been moved away to the right along the mounting rail. A minimum distance of 30
mm/1.18 inch is required between the base module to be replaced and the previously adjoining
base modules.
Dismounting an entire BL20 station in chronological order
† Switch off the power to the distribution modules (Bus Refreshing and Power Feeding)
† Pull the electronics modules
† Disconnect wiring
† Loosen/remove end bracket and end plate
† Dismount base modules
† Dismount gateway
Dismounting electronics modules
DANGER
Dangerous electric voltage at modules with 120/230 VAC
Acute danger to life due to electric shock!
† Turn of the voltage supply
† Secure the voltage supply against restart.
† Ensure that the unit is de-energized.
Fig. 316: Dismounting electronics modules
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