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The grounding policy is nothing more than to avoid disturbance for safety, and the policy of grounding to PLC must not be attached to the disturbance at the power supply and input and output terminals, so the accurate grounding system is one of the primary methods for the PLC control system to resist electromagnetic disturbance. There are floating and direct grounding formations.

1. Japanese PLC special wireless communication terminal DTD435M embedded RS232/RS485 dual interfaces, adaptive Mitsubishi N:N: protocol, Omron HOST Link protocol, Delta and Yonghong and other Modbus RTU protocols. No programming, no secondary development, can directly replace RS232/RS48 ...

Xinjie PLC丨The condition is established, why is the corresponding coil not in place? There are two possible reasons for this: (1) The same coil may be used in multiple places to perform the double coil output, and the coil on the rear side will operate first when the double coil is output. （2 ...

Mark point, also known as reference point, provides measurable points for all processes in the surface mount process to ensure the final positioning accuracy.

Problem example 1 On the telegram OC problem, measure the 5, 6, and 7 pins of N1 to be 2V. Pin 7 is not 0V for the alarm reason. 1. The "imaginary short" rule of the amplifier is still established, and the N1 chip is good to judge, but the fault is in the bias circuit. 2. Further analysis, at this moment the differential amplifier has ...

1. The cause of the leakage problem Some sites use frequency converters to control the motor, which will present the problem of leakage, and the leakage voltage ranges from tens of volts to 200 volts. In view of this problem, the reason for this problem is explained and stated as follows. Depend on...

After overhauling and confirming that all connections of the system are correct, power on the relevant modules until the card indicator shows normal. The initiation process of the system after the scheduled repair is as follows: (1) Power supply. Turn on the power supply equipment (including the UPS...)

In order to prevent the control signal line between the PLC and the inverter from being disturbed by the space electromagnetic field, the outer layer of these control signal lines can be connected with shielded wires to improve the anti-interference ability of the system. This kind of wiring must be noted, and only one point can be selected for the shielded connection address. Whether it's on the PLC side, or ...

The XDHI XLH series of 16-axis high-performance EtherCAT controllers is the perfect choice for small motion control. Product model XDH-30A16-E/XDH-30A16L-E Small/16-axis type Frequency: 600MHz Program Capacity: ...

1. Introduction TP Contact Industrial Graphic Displayer (referred to as contact screen) is a human-machine interface (known as HMI or MMI in foreign countries) that connects humans and machines (mainly PLC), which is known as the face of PLC. It is a generation ...

There are many novices who are not familiar with the false load about the maintenance inverter, and the maintenance inverter uses the false load to keep many of their modules, because the maintenance novice generally does not know how to do this, and now the electric light is on to clarify that the module is going to be broken. A dummy load is a load with a resistor of several hundred ohms ( ...

Communication: (1) Radiation disturbance; (2) Conduction disturbance Anti-disturbing method: Regarding the disturbance signal transmitted by the radiation method, it is mainly weakened by wiring and shielding the radioactive source and the disturbed line. With regard to the disturbance signal transmitted through the line, ...

1. Hardware purchase At present, there are a large number of PLC products on the market, more and more cost-effective, and the optional fields are getting bigger and bigger. 1. At the beginning of the scale of the system, it should be determined that the system is a single PLC machine.

The most direct cause of cable problems is the breakdown due to the loss of insulation. First of all, there are: a. Overload operation. Long-term overload operation will increase the temperature of the cable, aging the insulation, resulting in breakdown of insulation and degradation of construction quality. b. Electrical: the construction process of the cable head does not meet the requirements.

1. Common problem phenomena When the RS-485 port of the PLC is connected to the computer through the non-blocking PC/PPI cable, the connection between the PLC and the PLC, or the communication between the PLC and the inverter, touch screen, etc., the communication port is damaged, and the more common damage conditions are as follows: (1) R1 or R2 is burned ...

1. Operating temperature. The inverter is a high-power electronic component, which is easily affected by the operating temperature, and the product is generally required to be 0-55 °C, but in order to ensure the safety and reliability of the operation, it should be considered to leave room for use, and it is best to control it below 40 °C. In the control box, the inverter ...

Confirm the rated power and resistance value of the braking resistor. The rated power of the braking resistor should be determined according to the power and moment of inertia of the motor, and the resistance value should be selected according to the specifications of the VFD. In the VFD's parameter settings, find the parameters related to the braking resistor, such as the braking resistor selection ...

The problem of the inverter is not only affected by external factors, but also by internal factors. 1. The inverter parameter setting is unreasonable and countermeasures to make the inverter work normally, in addition to the normal equipment, the parameter setting is also very important, if the parameter is not set properly, it will not be able to ...

Input and output loop debugging 1. Analog input (AI) loop debugging. Carefully check the address assignment of the I0 module; Check whether the loop power supply mode (internal power supply or external power supply) is consistent with the field instrument; Use a signal generator to add a signal to each channel at the field end, generally taking 0, 5 ...

The World Economic Forum (Davos Forum) Annual Meeting 2016 will be held in Davos from 20 to 23 this month, with the theme of "Mastering the Fourth Industrial Revolution". ...