Common troubleshooting methods for Omron are as follows:
(1) Failure of peripheral circuit components
This kind of failure is more common in PLC maintenance, and it is generally a frequent occurrence in failures after a certain period of work. In the PLC control loop, if there is a component damage fault, the PLC control system will immediately and automatically stop working. The input circuit is the port of the PLC to accept the input signals such as switching quantity and analog quantity, and the quality of its components, wiring mode and whether it is reliable are also important factors affecting the reliability of the control system.
For the switching output, the output of the PLC has three forms: relay output, thyristor output and transistor output, and the specific choice of which form of output should be decided according to the load requirements.
In addition, the output terminals of the PLC have a limited load capacity. If the specified maximum limit is exceeded. An external relay or contactor must be connected. to work properly. The quality of actuators such as external relays, contactors, and solenoid valves is an important factor affecting the reliability of the system. Common faults include short circuits in the coil, mechanical failures that cause immobility of the contacts or poor contact.
(2) Poor terminal wiring contact
This kind of fault occurs after the PLC has been working for a certain period of time with the increase in the frequency of equipment action. Due to the defects in the wiring of the control cabinet or the intensification of vibration in use and the mechanical life, the terminal posts of the terminals or components are easy to loosen and cause poor contact.
The method of troubleshooting this kind of fault is to use a multimeter, with the help of the control system schematic diagram or PLC logic ladder diagram for fault diagnosis and maintenance. For the wiring of some important peripheral terminals, in order to ensure reliable connection, the method of soldering cold-pressed sheets or cold-pressed pins is generally used.
(3) Functional failure caused by interference of Omron PLC
The various types of PLCs used in automation systems are control devices specially designed for industrial production environments. In the design and manufacturing process, multi-level anti-interference and selected component measures are adopted, so it has a strong ability to adapt to harsh industrial environments, operational stability and high reliability. Therefore, it can generally be used directly in an industrial environment without any special measures.
The interference experienced by the PLC can be divided into internal interference and external interference. In the actual production environment, external interference is random, independent of the system structure, and the source of interference cannot be eliminated and can only be limited on a case-by-case basis.
Internal interference is related to the structure of the system. It is mainly caused by the AC main circuit and analog input signal in the system, and the internal interference can be suppressed to the greatest extent through careful design of system circuits or system software filtering.
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