Specifications

Copyright © AMETEK
6.1 Description
The FOCUS chassis consists of a standard width
metal rack (3 RU high) with slots/guides for
channel modules and common equipment. The
motherboard/backplane is installed on the rear of
the chassis. The chassis serial number identifica-
tion is affixed near the lower left corner of the
motherboard, when viewed from the rear.
The front of the motherboard, which is on the
inside of the chassis, provides the connections for
the system modules, or common equipment, and
the channel modules. When you insert the
modules into the chassis, they connect to the
inside face of the motherboard.
The motherboard’s rear panel, which is on the
outside of the chassis, provides the interface
connections for the chassis, the common
equipment, and the individual channel modules.
The connectors for the chassis and the common
equipment are on the lefthand side of the mother-
board. The connectors for the channel modules are
on the righthand side.
The DIN connectors are press fitted to the moth-
erboard (i.e., this is a solderless connection). They
are designed with uneven length pins, which
allows for “hot” insertion of any module.
6.1.1 Expansion Chassis
It is possible to expand the number of channel
module slots from 12 to 24 by adding one
expansion chassis. A maximum of one expansion
chassis can be added to any FOCUS node. This is
done by connecting the main and expansion
chassis via a ribbon cable. The ribbon cable is 6”
pin for pin with a 20 pin “Amp” type ribbon cable
connector at each end. The ribbon cable plugs into
the backplane connector labeled P1 Expansion on
each chassis. Typically, the expansion chassis is
mounted directly above the main shelf, but can be
mounted directly below if necessary. The
expansion chassis must have at least one power
supply and one expansion module installed to be
used. Both the main and expansion chassis have
identical motherboards permitting a spare main
shelf to be used for expansion, if needed. When an
expansion chassis is ordered from the factory, the
label on the front edge will specify channel
module locations 13 – 24 and "Expansion" in the
slot where the Maintenance module is normally
installed.
6. Chassis
6
Chassis
Inject/Eject Lever
Motherboard
DIN
Connector
Interface
Module
Module
Figure 6–1. Example FOCUS Module.