plc
UNITARY
The Unitary PLC contains every feature of a basic system in one box. They are attached to the machine
being controlled.
Example: Allen-Bradley Micrologix 1000
MODULAR
These use a range of modules that slot together to build up a system. The basic modules are the power
supply, the main module containing the CPU, the input module and the output module. Other modules such
as A/D converters may be added. The main advantage is that the number of input and output terminals can
be expanded to cope with changes to the hardware system.
Example: Allen-Bradley Micrologix 1200
RACK MOUNTING
This is a similar concept to the modular design but the modules are on standard cards that slot into a
standard rack inside a cabinet.
Example: Allen-Bradley SLC 500[/quote]
UNITARY
The Unitary PLC contains every feature of a basic system in one box. They are attached to the machine
being controlled.
Example: Allen-Bradley Micrologix 1000
MODULAR
These use a range of modules that slot together to build up a system. The basic modules are the power
supply, the main module containing the CPU, the input module and the output module. Other modules such
as A/D converters may be added. The main advantage is that the number of input and output terminals can
be expanded to cope with changes to the hardware system.
Example: Allen-Bradley Micrologix 1200
RACK MOUNTING
This is a similar concept to the modular design but the modules are on standard cards that slot into a
standard rack inside a cabinet.
Example: Allen-Bradley SLC 500[/quote]
