GE PQMII-T20 Power module
It is very convenient to control the system with PLC. This is because: first of all, the establishment of PLC control logic is a program, which replaces hardware wiring. Programming is more convenient than wiring, and changing the program is more convenient than changing the wiring!
Secondly, PLC hardware is highly integrated and has been integrated into various miniaturized modules. Moreover, these modules are matched and have been serialized and standardized. The modules required for various control systems are mostly supplied by * * * from PLC manufacturers and can be purchased on the market. Therefore, the hardware system configuration and construction are also very convenient.
Because of this, the word “can” is only available with programmable controllers. For software, its program can be compiled, and it is not difficult to compile. For hardware, its configuration is variable and easy to change.
work environment
(1) Temperature PLC requires an ambient temperature of 0~55oC. During installation, it should not be placed under elements with large heat, and the surrounding ventilation and heat dissipation space should be large enough.
(2) Humidity To ensure the insulation performance of PLC, the relative humidity of air should be less than 85% (non condensing).
(3) The vibration shall keep the PLC away from strong vibration sources and prevent frequent or continuous vibration with vibration frequency of 10~55Hz. When vibration is unavoidable in the use environment, damping measures must be taken, such as damping rubber.
(4) The air shall be free of corrosive and flammable gases, such as hydrogen chloride, hydrogen sulfide, etc. For the environment with more dust or corrosive gas in the air, PLC can be installed in the control room or control cabinet with good sealing.
(5) The power supply PLC has certain ability of resisting power line interference. In the environment with high reliability requirements or serious power interference, isolation transformer with shielding layer can be installed to reduce the interference between the equipment and the ground. Generally, PLC has DC 24V output to the input. When external DC power supply is used at the input end, DC regulated power supply shall be selected. Due to the influence of ripple, ordinary rectifier and filter power supply is easy to make PLC receive error information.
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