GEM80-400
1. Introduction
Issue 3 04/99
ALSPA GEM80-400 CONTROLLER TECHNICAL MANUAL
Page 1-3
controller's analogue or digital input/output modules that interface with either
locally or remotely located plant equipment.
GEM
80 controllers have been successfully installed in many countries, in
industries as diverse as Automotive, Mining, Electricity Generation, Water
Treatment, Food, Oil, Gas and Steel.
A typical GEM
80-400 controlled system can be detailed as follows. The
controller communicates with system and plant components in a variety of ways
including ribbon cable highways, serial communication links and programming
tool connection ports. Communication to the user is via a four-character
alphanumeric display. Safety in a fault situation is provided by the watchdog
contacts; the three-position halt, prog, run Mode Switch provides added
security.
To make a working system it is necessary to:
(1)
Select a controller.
(2)
Select I/O equipment.
(3)
Select Central Highway Modules ( applicable to Enhanced Controllers
only )
(4)
Mount and wire the equipment and connect plant services and
output devices to I/O.
(5)
Hard-wire watchdog and safety circuits.
(6)
Connect a suitable GEM
80 programming tool, such as Gemesys 3,
and enter a program.
This manual details how such a system can be achieved. Before handling GEM
80 equipment your attention is drawn to the sections detailing 'Handling
Precautions for Printed Circuit Boards' and 'Safety and Handling Information',
later in this chapter.
1.3. GEM
80-400 Series Controller
The GEM80-400 Series Controller, which currently consists of the Standard and
Enhanced models, is a medium/large powerful PLC which is designed to control
and monitor processes and machinery for complex industrial plant applications.
The GEM80-400 Controller is compatible with other controllers in the GEM80
range, utilising the same I/O structure and a modified version of the existing
control language. They may be programmed via a suitable GEM80
programming tool, such as Gemesys 3, using the GEM80 Ladder Diagram
Programming Language. The controller communicates with external devices via
a number of I/O modules accommodating both Basic and Verification I/O, and
can be configured to suit a wide variety of applications.
The GEM80-400 Controller can handle extensive digital and analogue control, in
addition to report generation. The flexible structure allows interface to a variety
of plant equipment while the extended GEM
80 Instructions and Special
Functions Set covers most requirements.
In large distributed systems, the availability of several multi-drop serial links makes
the system ideally suited for centrally supervised or co-ordinated operations.
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