arithmetic operations such as user-oriented instructions, and through digital or
analog input / output control various types of machinery or production
process. Programmable controller and related peripherals, according to the
easy and industrial control systems into a whole, easy to expand its function
principle design.
In short, the programmable controller is a computer, it is designed for
industrial applications and the design and manufacture of computer. It has a
rich input / output interface, and has strong driving ability. But the
programmable controller products are not directed to a specific industry
application, in practical application, its hardware according to actual need
optional configuration, the software according to the control requirements for
the design and preparation of.
The characteristics of PLC:
One, high reliability, strong anti-interference ability and high reliability is the
key performance of electrical control equipment
PLC due to the use of modern large-scale integrated circuit technology, strict
production process, the internal circuit adopts advanced anti interference
technology, has very high reliability. Such as the Mitsubishi F series produced
by PLC MTBF is high up to 300000 hours. Some use of redundant CPU PLC
MTTF mean time to failure is longer. From the PLC machine circuit, the use of
PLC control system, and the same scale relay systems, electrical wiring and
switch contacts have been reduced to hundreds or even thousands of fault,
also reduced greatly.
In addition, PLC with hardware fault self testing function, failure can be timely
warning information. In the application software, applications can also be
incorporated into the peripheral device fault diagnosis program in the system,
except PLC circuit and equipment were also obtained self diagnosis of fault
protection. Thus, the entire system with high reliability is also not surprising.
Two, matching complete, perfect function
Applicability of PLC development today, has formed a large, small scale, in
various series of products. Can be used for various scale industrial control
occasions. In addition to the logic processing function, modern PLC mostly
with complete data operation ability, can be used for various digital control
field. In recent years the function of PLC cells in large numbers, the PLC
penetrated into the position control, temperature control, CNC and other kinds
of industrial control. With PLC communication and enhance the ability of man-