BECKHOFF BC3150 - Manual (Page 18)

Safety Instructions
16 Fieldbus Components
Installation
The Bus Coupler and all the Bus Terminals can be clipped, with a light press, onto a 35 mm mounting rail. A locking
mechanism prevents the individual housings from being pulled off again. For removal from the mounting rail the
orange colored tension strap releases the latching mechanism, allowing the housing to be pulled off the rail without
any force.
Up to 64 Bus Terminals can be attached to the Bus Coupler on the right hand side. When plugging the components
together, be sure to assemble the housings with groove and tongue against each other. A properly working
connection can not be made by pushing the housings together on the mounting rail. When correctly assembled, no
significant gap can be seen between the attached housings.
Warning
Insertion and removal of Bus Terminals is only permitted when switched off. The
electronics in the Bus Terminals and in the Bus Coupler are protected to a large measure
against damage, but incorrect function and damage cannot be ruled out if they are plugged
in under power.
The right hand part of the Bus Coupler can be compared to a Bus Terminal. Eight connections at the top enable the
connection with solid or fine wires from 0.08 mm² to 2.5 mm². The connection is implemented with the aid of a spring
device. The spring-loaded terminal is opened with a screwdriver or rod, by exerting gentle pressure in the opening
above the terminal. The wire can be inserted into the terminal without any force. The terminal closes automatically
when the pressure is released, holding the wire securely and permanently.