GEM80-400 Product Overview
Issue 3 04/99 ALSPA GEM80-400 SERIES CONTROLLERS TECHNICAL MANUAL Page xxi
Product Overview
1. Introduction
This section of the manual is mainly intended for the user who is familiar with
previous GEM
80 controllers, and only highlights features new to the GEM
80-400 .
Please refer to the relevant sections of this manual for more complete and
detailed information.
The GEM
80-400 Standard Controller and the GEM80-400 Enhanced Controller
have extended the already rich functionality of the existing GEM
80 controller
series by offering a number of new features, each of which has been added with
the aim of making the overall controller smaller, more cost effective and easier
to use.
2. GEM
80-400 Series Controller Facilities
2.1. Serial Links
The controller has three physical serial ports, one of which is used as the main
"programming port" but may also be used to connect to a printer or other similar
device.
All three serial ports are galvanicly isolated from the GEM
80-400 and may be
directly connected to plant equipment via the front panel mounted, industry
standard, D-types, and do not require termination panels. All the serial port
connectors are provided with plant connector retention facilities.
The two general purpose serial ports provide RS232 and RS485 signal levels, and
the Printer/Programming Port produces 20mA and RS232 signal levels. RS232
level CTS and RTS signals are provided by all ports.
Each of these serial ports has a pair of visual line activity indicators, one
monitoring the receive line and one monitoring the transmit line. This facilitates
fault finding and commissioning of the serial links.
The general purpose serial link ports can now communicate with up to 100
GEMSTART CCUs each, as opposed to the 64 allowed on previous controllers.
2.2. Real Time Clock
The GEM
80-400 Processor Module has an integral Real Time Clock device that
continues to function during power supply interruptions, provided a battery is
fitted.
The time and date may be read and written via the E-tables from the Data List
screen of a suitable GEM
80 programming tool. The clock E-tables are read-only
when accessed directly by the ladder program, however they can be written to
To Next Page
Loading...