Expansion of Basic System with External
How to Mount and Remove the Bus Units
Bus units are also mounted on a standard mounting rail. Mount the bus units in the same way you
mounted the controller
or a power supply module.
There are small hooks on the sides
of the bus units that interlock them.
Hook the
bus unit onto the top of the standard mounting rail beside the programmable controller.
Press the bus unit down firmly until the slide audibly snaps into place.
To remove
bus units, proceed as follows:
Loosen the connections (flat ribbon cable) to the adjoining devices.
Using a screwdriver, press down on the slide.
Swing the bus unit up and out of the standard mounting rail.
How to Connect Bus Units to the Basic Unit or interlocking Bus Units
Pull the flat ribbon cable connector (top left on the bus unit) out of its holder.
Plug the connector into the receptacle on the right side of the basic unit or into the adjacent
receptacle of the bus unit on the left side (see Figure 5-2).
Figure 5-2. Connecting the Bus Units
5-2
EWA 4NEB812 6210-02
