Product Overview GEM80-400
Page xxviii ALSPA GEM80-400 SERIES CONTROLLERS TECHNICAL MANUAL Issue 3 04/99
6. Compatibility
6.1. I/O
The GEM
80-400 Processor Module is compatible with:
•
All Basic I/O Modules (excluding the block I/O)
•
All Verification I/O Modules
•
Verification I/O Expanders
•
Verification Remote I/O
•
GEMSMART I/O
•
GEMSTART CCU
•
ESP (all variants)
•
All Fast I/O Modules
6.2. User Program
The GEM
80-400 Series Ladder Diagram Programming Language incorporates all
of the features that the normal GEM
80/131, GEM
80/16x, GEM
80/3xx Controllers
possess, and has an instruction capacity that should allow most user application
programs to be ported with little or no difficulty
In general, the following points should be considered when porting user
application programs:
•
P-table layout. (The layout closely matches that of the GEM 80/131.)
•
Relying on the I/O transfer failure to automatically shut down the controller.
•
The use of undocumented V-table 'Features'.
•
Timing dependent upon the controllers free running scan time.
•
131 user programs that use the "DELAY" instruction may need the associated
VALUE parameter dividing by 10.
•
Q-tables are reserved for floating point operations and should not be used for
general workspace.
•
Any user programs that expect Verification I/O Modules at A/B 0 to A/B15.
7. Maintenance and Installation Cost Reduction Features
7.1. System Level Considerations
The major hardware components of the previous GEM
80 controllers have been
combined onto a single module. This saves a considerable amount of space in
the controller subrack, simplifies ordering and reduces site spares stock.
The space made available may be used for up to 8 I/O modules, in the case of
the GEM80-400 Standard Controller and up to 5 Central highway Modules in the
case of the GEM80-400 Enhanced Controller. This should help to reduce the
number of I/O Subracks required and reduce the installation cost for smaller
systems.
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