Austrian B&R power distribution module X20PD2113

　　Austrian B&R power distribution module X20PD2113

1、 The structural characteristics and interference pathways of industrial control software

In different industrial control systems, although industrial control software performs different functions, its structure generally has the following characteristics:

Real time performance: Some events in industrial control systems have randomness, requiring industrial control software to be able to handle random events in a timely manner.

Periodic: After completing the initialization of the system, the industrial control software enters the main program loop. During the execution of the main program, if there is an interrupt request, the main program loop will continue after executing the corresponding interrupt service program.

Correlation: Industrial control software consists of multiple task modules, which work together, are interrelated, and interdependent.

Human factors: Industrial control software allows operators to intervene in the operation of the system and adjust its working parameters. In an ideal situation, industrial control software can execute normally. However, under the interference of industrial site environment, the periodicity, correlation, and real-time performance of industrial control software are disrupted, and the program cannot be executed normally, resulting in the loss of control of industrial control systems. Its manifestations are:

The PC value of the program counter has changed, disrupting the normal operation of the program. The data after PC value interference is random, which causes program execution chaos. Under the guidance of PC value errors, the program executes a series of meaningless instructions and often enters a meaningless "dead loop", causing the system to lose control.

The input/output interface status is disturbed, which destroys the correlation and periodicity of industrial control software, causing system resources to be monopolized by a certain task module, resulting in a "deadlock" in the system.

The data collection error has increased. Interference invades the forward channel of the system and superimposes on the signal, resulting in increased data acquisition errors. Especially when the current sensor interface to the channel is a small voltage signal input, this phenomenon is even more severe.

The RAM data area is affected by interference and changes. According to the different channels of interference and the nature of the interfered data, the damage to the system varies. Some may cause numerical errors, some may cause control failures, some may change the program state, and some may change the working state of certain components (such as timers/counters, serial ports, etc.). When developing a remote meter reading system for electric power, the author encountered situations where RAM data was frequently destroyed due to strong electromagnetic interference on site.

Control status malfunction. In industrial control systems, the output of control states is often determined by the input of certain conditional states and the logical processing results of conditional states. In these stages, the intrusion of interference can cause conditional state errors, leading to increased output control errors and even control malfunctions.

　　Austrian B&R power distribution module X20PD2113

When purchasing an industrial computer power supply, be sure to pay attention to the following points.

1. Current magnitude

In fact, many friends do not pay attention to the current size when purchasing industrial computer power supplies. Sometimes tragedies can occur, so I hope everyone must pay attention to the current when purchasing industrial computer power supplies.

2. Range of voltage tolerance

Everyone must have a clear understanding of the voltage range that their purchased industrial computer power supply can withstand in order to better utilize and control the power supply of the industrial computer.

3. Environmental requirements

Everyone must have a clear understanding of the requirements of the industrial computer power supply for the environment in which it operates. We should eliminate environmental factors that may affect the operation of the industrial computer power supply in advance, which can also bring more security guarantees.

Mechanical experts remind everyone that although the maintenance of industrial computer power supply mostly relies on professional workers, we still need to pay more attention to details to ensure the safety of electricity use.

1、 The repaired industrial computer power supply must be checked for normal output voltage of each group, and the PowerGood signal should also be checked.

2、 If there are parts that need to be replaced when repairing the power supply of the industrial computer, then it is important to pay attention to the special position of the heating shrink tube.

3、 When repairing the power supply of an industrial computer, be sure to pay attention to locking the screws and not leave them inside the power supply to avoid short circuits.

4、 The repaired power supply of the industrial control computer must be checked by inserting it into the motherboard and burning it on power. This can directly check whether the power terminals of the industrial control computer are intact.

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