Troubleshooting steps of Hollysys DCS system

1. The connection line is loose and the contact is poor When the run indicator of the PLC turns red, the position of the plug changes to green with a manual move, indicating that the plug is loose, and it is best to replace the new connecting wire, and the plug is frequently plugged and unplugged, which will also lead to poor contact. 2. Strong electrical interference (external)

1. Configuration of the control loop The configuration of the control loop is essentially to use the various basic functional modules provided by the system to form a variety of actual control systems. At present, the configuration methods provided by various DCSs are different, and they can be summarized as having a specific computing module connected ...

1、-10—10V。 When the voltage of -10V-10V is converted to F448-0BB8Hex (-3000-3000) at 6000 resolution; At 12000 resolution, it is converted to E890—1770Hex (-6000—6000). 2、0—10V。 At a voltage of 0-10V, at a resolution of 12000 ...

1. Grounding problems The grounding requirements of the PLC system are relatively strict, and it is best to have an independent dedicated grounding system, and it should also be noted that other equipment related to PLC should also be reliably grounded. When multiple circuit grounding points are connected together, unexpected currents can be generated, resulting in logic errors or ...

In general, PLCs are extremely reliable devices with a very low failure rate. The probability of hardware damage such as the CPU of the PLC or software running errors is almost zero; If the PLC input point is not caused by strong current intrusion, it will hardly be damaged; The normally open point of the PLC output relay, if it is not a short circuit of the peripheral load ...

1. Data backup When carrying out maintenance, we must cut off the power, data backup between power outages is an important link, for the data that needs to be archived for a long time, you can back up the historical trend data to the mobile hard disk, and then turn off the Windows-based operating system (Note...

1. Logic control of switching quantity This is the most basic and most extensive application field of PLC, which replaces the traditional relay circuit to achieve logic control and sequence control, which can be used for the control of a single device, as well as for multi-machine group control and automatic assembly line. Such as injection molding machines, printing machines, ...

LE series is a new generation of high-performance small and medium-sized PLC products launched by Hollysys, which is suitable for small and medium-sized industrial equipment control and distributed long-distance monitoring applications. LE-PLC combines the compact structure of small PLC products with the abundant functional advantages of medium-sized PLC products, and can support up to 20 local IOs or long ...

The control of pulse amount is mostly used for angle control, distance control, position control and so on of stepper motor and servo motor. The following is an example of a stepper motor to illustrate each control mode. 1. Angle control of stepper motor. First of all, it is necessary to clarify the number of subdivisions of the stepper motor, and then determine the stepper ...

1. PLC programmable logic controller (programmable controller). 2. DCS system pays more attention to the field of process control. Such as chemical, smelting, pharmaceutical, etc. It mainly monitors and controls some field parameters, while PLC focuses on logic control. machining). Of course, the PLC's ...

PLC is essentially a kind of computer dedicated to industrial control, and its hardware structure is basically the same as that of a microcomputer, and its basic composition is as follows: 1. Power supply The power supply of the PLC plays a very important role in the whole system. If you don't have a good, reliable power system that is ...

Examining the hierarchical structure of DCS, DCS level and control management level are the two most basic links that make up DCS. The process control stage specifically realizes the decentralized control functions such as signal input, conversion, operation and output. The controls at the process control level vary in different DCS, ...

2. Interference in the control system and its sources On-site electromagnetic interference is one of the most common factors in PLC control system and most likely to affect the reliability of the system. It is therefore essential to know the source of on-site disturbances ...

Serial communication is done using 3 wires: (1) ground, (2) sending, and (3) receiving. Since serial communication is asynchronous, ports are capable of sending data on one wire and receiving data on the other. Other threads are used for handshakes, but are not required. Serial communication is the heaviest ...

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1. Rich networking and interface functions, easy to deploy It supports 5G/4G/3G/WIFI/Ethernet, WAN/optical fiber and other network access modes, network port/serial port/IO port/CAN port and other equipment access, and supports LoRa wireless transmission, disconnection reconnection and multi-network mutual backup function. 2. Abundant ...

1. The application form of PLC in CNC machine tools PLC is used in CNC machine tools, and there are usually two forms: one is called built-in: the other is called free-standing. Built-in PLC is also known as integrated PLC, the CNC system in this way, at the beginning of the design of the NC and PLC combined ...

CNC machine tool PLC (programmable logic controller) has the following common faults in the operation process, and the following corresponding solutions are taken for the faults in the work engineering to make the equipment operate normally. 1. The power grid fluctuates too much, and the PLC does not work It is manifested as no output of the PLC. Check first ...

3. Main anti-interference measures (1) Reasonable treatment of power supply to suppress the interference introduced by the power grid For grid disturbances introduced by the power supply, an isolation transformer with a shielded ratio of 1:1 can be installed to reduce the interference between the equipment and the ground.