490NAC72100 SCHNEIDER Processor module

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Product Details：

490NAC72100 SCHNEIDER Processor module

Brand：SCHNEIDER Model number：490NAC72100

Country of origin: France Product weight：0.53kg

HS code：853710119

Product Dimensions：

General structure and fault type of PLC control system

PLC control system is mainly composed of input part, CPU, sampling part, output control and communication part, as shown in Figure 1. The input section includes the control panel and input

Insert board: Sampling part includes sampling control board, AD conversion board and sensor :CPU, as the core of the system, completes data receiving, data processing and output

Control signal; The output part of some systems use DA template, the output signal is converted into analog signal, through the power amplifier drive actuator; Most systems will directly

The output signal is given to the output template, which drives the actuator to work. The communication part consists of a communication template and a host unit.

Because PLC itself has minimal possibility of failure, the system failure mainly comes from the peripheral components, so its failure can be divided into the following types:Input fault, that is, the operator's operation error;

■ Sensor failure;【 Actuator fault;- The PLC software is faulty

These faults can be analyzed by proper fault diagnosis method and monitored in real time by software, so as to forecast and deal with faults.

The fault diagnosis method of PLC control system

Macro diagnosis of PLC control system fault

Fault macro diagnosis is based on experience, referring to the occurrence of fault environment and phenomenon to determine the fault location and cause, PLC control system fault macro diagnosis side

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