Mitsubishi Elevator PLC

　　Modern industrial production equipment, a large number of digital and analog Mitsubishi elevator control device, for example, the motor starts and stops, the opening and closing of the solenoid valve, product count, setting of temperature, pressure, flow, and control automatic control problems in the industrial field, a Mitsubishi Elevator programmable controller (PLC) has become one of the most effective tools to solve. PLC control system design should pay attention to the following points.
　　Mitsubishi Elevator programmable logic controller (PLC) programming and Mitsubishi Elevator optional: 
　　Currently on the market Mitsubishi Elevator PLC control system, in addition to domestic brands, foreign brands: Japan OMRON, MITSUBISHI, FUJI, IDEC, HITACHI, Panasonic, Siemens, Germany, South Korea's LG and so on, how to buy Mitsubishi Elevator PLC control system products?
　　1. Optional Mitsubishi Elevator PLC control system programming:
　　Mitsubishi Elevator PLC control system programming can be taken in three ways: programming statements with the handheld programmer, of Mitsubishi Elevator PLC control system programming only with manufacturers under the table in the statement. Middle of easy-to-site commissioning and the small size and low cost, but the the Mitsubishi elevator PLC control system programming efficiency is low adapt the model type is more suitable for the system capacity, with less system. The graphics programmer programming, this approach uses a graphical programming, convenient and intuitive, the the general electrician short-term can be applied with ease, but higher prices programmer. Package Programming with IBM and IBM-compatible personal computer + Mitsubishi PLC control system, this way is the most efficient one way, is the most commonly used one, but most of the expensive package.
　　Try to use the products of the big companies, because the quality of their products is guaranteed, and good technical support, and after-sales service is also generally better, is conducive to future product expansion and soft and hardware upgrades.
　　System should first determine the control of the control system stand-alone system with Mitsubishi Elevator PLC or with Mitsubishi Elevator PLC control system to form a network, and thus calculate the input and output (I / O) points, and in the purchase of the Mitsubishi Elevator PLC control system when the reserve margin of 10% on the basis of the actual needs points.
　　Determine load type According to Mitsubishi Elevator PLC control system output of the load carried by DC type or exchanges type, high-current or low current, and Mitsubishi Elevator PLC control system output frequency of the action etc., which determine the output using relay output or transistor output or thyristor output. The different load selection of different output mode of the stable operation of the system is very important.
　　Storage capacity with the instruction execution speed is an important indicator of the PLC selection, the greater the amount of general storage, faster PLC the higher prices, foreign manufacturers products are much the same, but also have some differences.
　　6. "COM" point selection,
　　Different PLC product, the "COM" number of points is not the same, some a "COM" points with eight output points, some with four output points, also with one or two output points. When the load of many kinds and large current, a "COM" output points with a 1-2 point less number of load type for a long time, the use of a "COM" point with 4-8 output point.
　　Manufacturers developed different software focus systematically compatibility when purchasing, yet did not find completely compatible products, the product should be based on a systematic and rational choice Mitsubishi Elevator PLC control system.
　　Second, the expansion module optional
　　For small systems, such as the 80 points within the system, generally do not need to be extended; When the system is large, it is necessary expansion. Products of different companies, the system is the total number of points and the number of expansion modules have a limit, when the expansion still can not meet the needs, can be a network structure. Individual instructions of the same time, some manufacturers do not support expansion modules, therefore, to pay attention during the software programming. When the temperature analog modules, the manufacturers also have some of the provisions, see related technical manuals.
　　Mitsubishi Elevator PLC control system network design
　　Mitsubishi Elevator PLC control system network design, its difficulty is much greater than the PLC stand-alone control, she was more familiar with the models should be used first, have a more in-depth understanding of their basic instruction and function of instruction, and the instruction execution speed and user program storage capacity should also be careful to understand. Otherwise can not meet the real-time requirements, resulting in a system crash. In addition to the communication interface, the communication protocol, the data transmission rate must be considered.
　　Finally, to Mitsubishi Elevator PLC control system manufacturers to seek network design and software support and detailed technical information, As for the selection of several layers of workstations, in accordance with the size of the system.
　　Fourth, the software development
　　Selected Mitsubishi Elevator PLC control system product specification before in preparation software, you should first become familiar with, and to be familiar with and then programming. The use of graphical programming package programming, can be programmed directly, handheld programmer programming should draw ladder, then programming, so you can reduce errors, speed is also fast compiled completed after the first air operation until each action is normal, and then debugging on the device.
　　1 power circuit
　　Mitsubishi Elevator PLC control system powered AC85-240V (DC24V) to adapt to a wide power range, but for anti-jamming, power-purifying element (such as the power supply filter, 1:1 isolation transformer should be retrofitted)
　　Mitsubishi Elevator PLC control system DC24V power use
　　Each company Mitsubishi Elevator PLC control system products generally have DC24V power, but the power supply capacity is small, for tens of milliamps to several hundred milliamps, should pay attention to use it with a load capacity, at the same time do a good job against short circuit measures (because overload or short-circuit of the power supply will affect the run of the of Mitsubishi Elevator PLC control system).
　　3 external DC24V power 
　　If the input circuit the DC24V power proximity switches, photoelectric switches, etc., and not enough the DC24V power capacity Mitsubishi Elevator PLC control system, from external DC24V power; but the power of the "not" end with the PLC DC24V power "and" COM "terminals connected, otherwise it will affect the run of the of Mitsubishi Elevator PLC control system. 
　　4. Input sensitivity
　　Manufacturers of of Mitsubishi Elevator PLC control system input voltage and current regulations, when the maximum input current or leakage current of the input element of the input current is greater than the Mitsubishi PLC control system, there will be a malfunction, reducing sensitivity. So shall apply the weak current input and leakage current to take protective measures, and the selection of the input for sink input Mitsubishi Elevator PLC control system.
　　Two-wire sensor (photoelectric switches, non-contact switch) LED limit switch input leakage current will generate input error or lights countermeasures bleeder resistor to reduce the input impedance for the connection resistance deduced from Figure 1 in the formula:
　　Transistor or triac output, received a greater impact on current equipment, it is necessary to consider the protection transistor and thyristor. The transistor and the thyristor can withstand the impact of current of 10 times the rated current, if exceeded, according to Figure 2, one of the Figure 3 to reduce it:
　　5. Inductive load handling
　　Input and output termination inductive load, surge suppressors or diode in parallel across the load a pole side of the cathode of the diode voltage (x) is connected.
　　6 external interlock with ground
　　Mitsubishi PLC control system to control the motor reversing, causing accidents and mechanical damage, should form a chain in the external loop counter-action, to avoid abnormal operation of the PC. 
　　Ground: GR terminal earth ground terminal. Used to prevent the induction of dedicated ground wire (cross-sectional area of 2mm2 wire) and a third grounding method (grounding resistance of 100Ω or less).
　　LG is the noise filter neutral terminal, a malfunction due to noise, or in order to prevent electric shock, LG and GR shorted, the third ground. The length of the ground line is preferably within 20m.
　　The ground wire with other devices sharing or connection with the metal structure of the building will be counterproductive, adversely affecting.
　　7 Mitsubishi Elevator PLC control system external drive circuit
　　Mitsubishi Elevator PLC control system output can not directly drive the load must be used in the external drive circuit can be driven with a solid-state relay or thyristor circuit, and should be used to protect the circuit and surge absorption circuit.