technology, with high reliability. For example, the production of the Mitsubishi
F series PLC MTBF of up to 300,000 hours. Some use of the redundant CPU PLC MTBF
of the longer working hours. From the PLC circuit of the machine, the use of PLC
control system constitutes, And the same scale contactor relay systems, electrical
wiring and the switch contact has been reduced to hundreds or even thousands of
parts per First, failure will be greatly reduced. In addition, PLC hardware failure
with self-detection function, the event of a failure in time
Alarm information. In the application software, the application also can be
incorporated into the external device fault self-diagnosis procedure, so that
the Department of
EC, in addition to the circuit outside the PLC and equipment has also been the
protection Fault self-diagnosis. In this way, the whole system can have very high
Reliability.
(2) supporting fully functional applicability
Development of PLC, have formed large, medium and small series products of
all sizes. Can be used in a variety of
Occasions, the size of the industrial control. In addition to the logical
processing functions, the most modern PLC equipped with a sophisticated operation
to the data .Edge, can be used for a variety of digital control. PLC in recent
years a large number of functional units, so that penetrated into the PLC bit
Home control, temperature control, CNC, etc. in a variety of industrial control .
Coupled with enhanced communications capabilities PLC and HMI Technological
development, the use of PLC control system composed of a variety of very easily.
(3) easy to learn and use by engineering staff welcomes the
PLC as a general-purpose industrial control computer, is the industrial
control equipment for industrial and mining enterprises. It interfaces easily,
programming Language is easy for engineers to accept. Ladder language graphic
symbols and expressions, and the relay circuit with When close, only a small amount
of PLC logic control command switch can easily achieve the functions of the relay
circuit. Is not familiar with electronic circuits, computer principles and do
not use assembly language to engage in industrial control computer opens the The
door.
(4) system design, construction work in small, easy maintenance, easy to transform
PLC connection with storage in place of logic logic, greatly reducing the
wiring and external control equipment to control systems based and construction
of the cycle is much shorter, at the same time has become easy to maintain. More
importantly, the same equipment have been changed so that
Change the procedure to change the production process possible. It is suitable
for multi-variety, small batch production of occasions.
(5) small size, light weight, low energy consumption
To ultra-small PLC as an example, the new varieties produced at the bottom
of size less than 100mm, weight less than 150g, power only a few watts. Small
size and easy to load due to internal mechanical, electrical and mechanical