A Programmable Logic Controller
(PLC) is a form of ruggedized computer used in industries for automation. They
are programmed to automate specific processes, machine functions and sometimes
the entire production line. PLCs receive information and data from connected
input devices and process these data and trigger output upon their programmed
instructions. Based on incoming inputs and outputs, real time insights on
machine productivity, temperature can be measured and the processes can be
automated. They are flexible and are controlled by robots, which are easily
adaptable.
Small PLCs are PLCs that have more
than 128 Input and Output (I/O) points but not more than 256 I/O functions.
They do not include any I/O enhancements fitted along with the basic system. As
PLCs are growing smaller and smaller in size, they have grown in their power
and functional capabilities. They are the best alternatives for replacing
relays and performing control functions in a bare minimal space. Advancements
in microelectronics and surface mount technologies have led to reduction in the
manufacturing costs of PLCs. Due to the ever-shrinking size of these PLCs, they
are rapidly replacing applications of relay controllers that were used in
compressors, packaging and labelling, textile and food industries.
The report “Global
Small Programmable Logic Controllers (PLC) Market by Architecture, Product
(Nano and Micro), Industry Vertical and Region 2014-2025: Growth Opportunity
and Business Strategy” gives a detailed
analysis and data for annual revenue which are available for 2014-2025. The
breakdown of key national markets by product type and industry vertical over
the forecast years are also included. The report consists of competitor’s
analysis and the predicted manufacture trend; and profiles PLC vendors
including market leaders and important emerging players. Specifically,
potential risks associated with investing in the Global Nano PLC market and industry
is assayed quantitatively and qualitatively through GMD's Risk Assessment System.
The major players in the market are ABB Ltd., Emerson Electric Co., General
Electric Co., Hitachi, Ltd., Honeywell International Inc., IDEC Corporation,
Mitsubishi Electric Corp., Omron Corporation, Robert Bosch GmbH, Rockwell
Automation Inc., Schneider Electric SE and Siemens AG.
The advantage of relay control over
PLC has to do with the fact that PLCs are economical in production and thus
reduce costs of production. Business constantly prefers PLCs, sometimes for
even higher costs. Small PLCs are suited well to handle complex sequencing
functions. Between the choice of large PLCs and small PLCs, the trade off
happens in terms of cost and size since both the PLCs perform similar
functions.
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