GEM80-400
Product Overview
Issue 3 04/99
ALSPA GEM80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Page xxxi
The Key Switch has the additional use of being able to reset the remote
programming edit lock. This feature is activated by moving the Key Switch from
PROG to HALT or NORMAL, and then returning it to the PROG position.
The Key Switch provides a mechanism, to help prevent a person remote to the
controlled machine accidentally causing the controlled machine to be
operated in an unsafe way, but must never be considered a substitute for
hardwired interlocks and other normal safety precautions.
All GEM80-400 controllers have the same key pattern and it is the responsibility of
the user to police the use of the keys.
7.6. Battery
The GEM
80-400 Processor Module and central highway RAM Modules maintain
the user program and data when the system power is unavailable.
The battery used by the controller may be replaced while the system is active. It
is mounted by a clip, behind the front panel of the module.
Note that batteries must be replaced while the module is powered in order to
prevent data corruption.
The GEM
80-400 controller will produce a battery low warning when the battery
is within 3 weeks of the end of its useful life.
This battery low warning is delivered by flashing the word 'BATT' on the GEM
80-
400 Processor Module's front panel alphanumeric display, and setting the
associated flags in the F-table.
The user program can test the battery warning flags and could, via the
application program and communication hardware, request that the battery be
renewed.
A GEM
80-400 system may be configured to operate without a battery by using
EPROM sub-modules.
A system with a valid user program in EPROM and without a battery (or fitted
with a dead battery) will normally default to the halt state at power up and will
require an explicit run command to run the user program. However the default
power up state may be set to "RUN" by setting the Mode Switch to the NORMAL
position, and setting the switch on the GEM
80-400 Processor's EPROM sub-
module to the "protect" position. This mode of operation has been included to
allow automatic start up of "maintenance free" remote systems and should be
used with extreme caution.
The user program, in an EPROM system without a battery, must assume that all
data tables apart from the P-tables will be cleared at power up.
7.7.
Controller Firmware Update.
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