GEM80-400
Product Overview
Issue 3 04/99
ALSPA GEM80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Page xxv
4.1.
User Program Storage Capacity
The user program storage capability of the GEM
80-400 Processor Module may
be expanded from 20000 to 40,000 ladder instructions by attaching an optional
RAM sub-module. This sub-module is fitted directly to the GEM
80-400 Processor
Module and does not require any additional rack space.
4.2.
User Program Storage in EPROM
The user program source, P-tables and user messages may be stored in EPROM
by fitting a FLASH EPROM sub-module. This sub-module is fitted directly to the
GEM
80-400 Processor Module in the same way as the RAM sub-module and
does not require any additional rack space.
The use of an EPROM sub-module, once successfully programmed, allows the
system to be used without a battery fitted, thus reducing maintenance.
The user program may be quickly transferred to and from EPROM by issuing a
simple command from the programming tool.
4.3. I/O
Modules
I/O Subracks to contain the Basic and Verification I/O Modules may be mounted
either underneath the controller subrack or in a separate cubical (subject to
certain distance and cabling restrictions).
The GEM
80-400 Processor Module provides one ribbon connection for Basic I/O
and one ribbon connection for Verification I/O. Verification I/O addresses may
be converted to Basic I/O addresses by using I/O subrack mounted Verification
Expander Modules.
4.4. FIP
The GEM 80-400 Processor module has an inherent but optional FIP
communication ability. FIP is a high speed data distribution and collation local
area network that supports a dual redundant media and a maximum of 255
nodes. (See the GEM
80-400 FIP Interface User Information sheet for more
information.)
5.
GEM 80-400S and 400 Enhanced System Specific Features
5.1. Central
Highway
The GEM
80-400S Controller provides space for up to 5 single width Central
Highway Modules to be fitted in the controller subrack, and is compatible with
the following modules:
