The power supply module supports 24V DC power supply and also has a normally open watchdog signal. The most obvious thing on this board is that there are 2 large capacitors, and multiple pieces of styrofoam are used for seismic reinforcement. This is an aluminum electrolytic capacitor used for power supply filtering, the specification is 35V, 1500μf.

Stop the switch and SD card, mini USB interface module, the most obvious here is a blue supercapacitor (supercapacitor), which is to continue power supply to the PLC when the PLC suddenly loses power to keep the data from being lost and to maintain the clock use. In the past, batteries were often used as backup power sources, but now supercapacitors are more robust and reliable.

The circuit board of the communication network has a total of 3 Ethernet ports, of which the rightmost one supports the Sercos real-time motion control bus at the same time. There is also a black PULSE HX5008 gigabit industrial-grade network filter in the small right corner, and a gigabit network expansion port on the back.

Finally, make a summary

From the internal anatomy of Schneider Electric’s Modicon M262, PLC is an important control device in the field of industrial automation. Whether it is the internal structure design, the workmanship of the circuit board, or the selection of electronic components, the stability and reliability of the controller are . The first important principle. Coupled with PLC's reproducible programming, eliminating the need for manual rewiring or reconnection of hardware, PLC has become the first choice for discrete control since its birth.
Of course, going back to the Modicon M262 controller itself that was dismantled this time, both the workmanship and the selection of CPU, memory and other components are very high-end and leading, high-performance processor, large memory, high-bandwidth communication network, and low power consumption. , This all represents the current development trend of PLC.