Use handheld, portable and desktop programmers, workstations and operator panels of varying complexity to program, debug, monitor, test and document, and print out program files via a printer.
Second, the main features of the programmable controller
High reliability
The MTBF of PLC is generally more than 40,000 to 50,000 hours, and the small and small PLCs such as Siemens, ABB, and Panasonic can reach more than 100,000 hours, and they all have perfect self-diagnosis functions, which can quickly judge faults and facilitate maintenance.
Flexible modular combination
Programmable controllers are serial products, usually using a modular structure to complete different task combinations. From 8 to 8192 points of I/O, there are various models and various function templates that can be flexibly combined, and the structural forms are also diverse.
Strong function
PLC uses microelectronics technology and microcomputer, and simple types have sequential control functions such as logic, timing, and counting. The basic type plus analog I/O, basic arithmetic operations, communication capabilities, etc. In addition to the functions of the basic type, the complex type also has extended computing power, multi-level terminal mechanism, intelligent I/O, PID adjustment, process monitoring, network communication capability, remote I/O, multi-processor and high-speed data processing capability .
Easy to program
PLC is suitable for ladder diagram, function block diagram, instruction table and sequential function table (SFC) programming for industrial control, and does not require much computer programming knowledge. The new programming workstation comes with a comprehensive software toolkit and can be programmed on any compatible personal computer.
Adapt to the industrial environment
The technical conditions of PLC can work in harsh environments such as general high temperature, vibration, shock and dust, and can work reliably in strong electromagnetic interference environments. This is the market survival value of PLC products.
Simple installation and maintenance
Compared with computer systems, PLC installations do not require special machine rooms and strict shielding. When using, the system can work as long as the various components are connected correctly. Each module is provided with a running and fault indication device, which is easy to find faults. Faults are detected and eliminated within a short period of time, and the downtime of faults can be reduced to the greatest extent, so that production can be restored quickly. Then repair the faulty module, which is especially suitable for large-scale production occasions.
Some PLC casings are composed of alloys that can work in poor working environments, with simple structures and heat sinks. fire protection etc.
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