GEM80-400 1. Introduction
Issue 3 04/99 ALSPA GEM80-400 CONTROLLER TECHNICAL MANUAL Page 1-9
A retention mechanism has been built into the subrack to provide module security in high
shock or vibration applications. This consists of two sliders which pass through notches
cut into the upper and lower edges of the PCBs. Pointers at each end of the sliders
indicate whether the modules are locked '
l
' or unlocked '
m
'. When the controller is
being used, these sliders should be left in the locked position.
Not all previously supplied modules are mechanically compatible with the moulded
subrack; any queries about compatibility should be referred to GEM
80 Customer Support
or your local representative.
The subrack has been designed to facilitate either front or rear mounting, details of which
are contained in Chapter 7 of this manual.
The subrack, containing the processor module, the power supply module, the I/O
modules and, in the case of an Enhanced system, any Central Highway Modules, is
referred to as the 'controller subrack'. I/O modules and additional power supply modules
require mounting in a separate subrack that is referred to as the 'I/O subrack'.
1.5.1.2. Controller Subrack Labelling
A label indicating the controller model (GEM
80-400 Standard or GEM
80-400 Enhanced)
and the subrack reference number (R0 for a controller subrack, usually R1 or R2 for an
I/O subrack) is fitted into the upper rail of the subrack. The lower rail holds a label that
indicates the power supply and processor module type numbers, in addition to
enumerating the I/O module slot positions. The lower rail label of the GEM
80-400
Enhanced Controller identifies also the five Central Highway slots. Module address
references are marked on the lower rail label by the user. The user should mark module
reorder numbers, with a proprietary marking pen, in the space provided on this label.
A Switch Setting Label is fitted on the inside of the right-hand side cheek of the subrack.
Refer to Chapter 7 of this manual for details of marking this label.
1.5.1.3. Fitting Controller Modules
Before installing or changing any modules, ensure that the power supply to the host
subrack s switched off.
Each module occupies one slot position and modules are inserted from the front of the
subrack. Care should be taken to ensure that the module slides directly down the
allocated slots and enter the backplane connectors with the minimum of force.
Modules are withdrawn by disengaging the sliders and operating the ejection handle to
release the connectors. The module can then be pulled along the slots and lifted clear of
the subrack.
1.6. GEM
80-400 Controller Modules Description
1.6.1. 8239 Processor Module
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