Fault phenomenon: The analog module CJ1W-DA041 outputs 4-20mA current for 4 channels, of which channels 2 and 3 are normal, and channels 1 and 4 have no current output.
Analyzing the circuit, the 4 current outputs use 4 integrated blocks LT1490 for D/A conversion, first measure the external components on the integrated block LT1490 on channels 1 and 4, and no problems are found with the triode and resistor.
It is suspected that the integrated block LT1490 on the 1st and 4th channels is damaged, because there are no spare parts in hand, try to use the method of reversal to judge, change the integrated block LT1490 on the 1st channel to 2 channels, and change the integrated block LT1490 on the 2nd channel to 1 channel.
As a result, the current output of channel 1 is normal, and the current output of channel 2 is not current, so it is judged that channel 1 is the fault of the integrated block LT1490, and the same method is used to judge that the 4 channel is also damaged by LT1490, and 2 new LT1490 are purchased, replaced, and troubleshooting.
(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, and the improper selection will reduce the reliability of the system
Low When it is severe, the system cannot work properly.
In addition, the load capacity of the output terminal of the PLC is limited. If the stated 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, etc.,
The terminal blocks or component binding posts are prone to loosening 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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