Standard and extendable TSX RKY racks

General points

TSX RKY racks form the base unit of Premium PLCs.

These racks serve the following functions:

Mechanical function:

they are used to mount a set of modules for a PLC station (i.e. supply modules, processors, discrete/analog input/output modules, application-specific modules). They can be mounted in cabinets, machine frames or on panels.
Electrical function:

the racks have a built-in bus, called bus X, which distributes:
- the required supply for each module on the same rack,
- service signals and data for the whole PLC station when this is made up of several racks.

NOTE: two families of racks are offered in several modularities (4, 6, 8 and 12 positions):

standard racks,
extendable racks.

Standard racks

They are used to make up a PLC station which is limited to a single rack.

This table presents the different standard racks:

Designation	Illustration
TSX RKY 6	6-position rack
TSX RKY 8	8-position rack
TSX RKY 12	12-position rack

Extendable racks

They are used to make up a PLC station which can have:

a maximum of 8 TSX RKY 12 EX racks,
a maximum of 16 TSX RKY 4EX/6EX/8EX racks.

These racks are distributed on a bus called bus X, whose maximum length is limited to 100 meters.

A bus extension cable assures rack-to-rack bus continuity.

For applications which require a greater distance, a bus X extension module allows the extension of two bus X segments from the rack which is supporting the processor to a maximum distance of 250 meters.

This table presents the different extendable racks:

Designation	Illustration
TSX RKY 4EX	4-position rack
TSX RKY 6EX	6-position rack
TSX RKY 8EX	8-position rack
TSX RKY 12EX	12-position rack