PLC memory, I/O units, I/O interface, peripheral interface and power supply

1. Memory of the programmable controller memory by read-only memory ROM, RAM of RAM and can be wipe most of the block of memory EEPROM, it is mainly used for work procedures, user program and data storage system. Read-only memory ROM to keep system programming, programmable controller in the production process will solidify system program in ROM, the user is immutable. The user program and intermediate data storage RAM of RAM, the RAM memory is a kind of high density, low power consumption, price cheap semiconductor memory, available do standby power lithium batteries. It stores content is volatile, lost after power off content; When the system power down, block user program can be stored in the read only memory EEPROM or supported by the high-energy battery RAM. EEPROM and ROM of non-volatile and RAM random access advantages, used to store need to long-term preservation of important data. 2. The I/O unit and the expansion of the I/O interface ( 1) PLC controller I/O unit internal external circuit input circuit function is PLC ( Such as trip switch, button, sensors, etc. ) Provided meet the requirements of the PLC input circuit voltage signal, through the photoelectric coupling circuit to the PLC internal circuit. Input circuit usually in photoelectric isolation and resistance capacity filtering way improve the anti-interference ability, input response time is in commonly 0. Between 1 ~ 15 ms. According to the different forms of the input signal, can be divided into analog I/O unit, digital I/O unit two kinds big. Depending on the input unit form, can be divided into basic I/O unit, extension, the I/O unit two kinds big. ( 2) I/O extended interface programmable controller using I/O interface to the I/O expansion unit connected to the PLC basic unit to realize, when the basic I/O unit of input or output points is not enough, when using I/O expansion unit can be used to extend the switch I/O points and increase the analog I/O terminals. 3. A peripheral interface peripheral interface circuit is used to connect the handheld programmer or other graphics programmer, text display, and can pass the peripheral interface of PLC control network. PLC by PC/PPI cable or use MPI card by RS - 485 interface connected to the computer, can realize programming, monitoring, networking, and other functions. 4. The role of power supply unit is the external power supply ( 220 v ac power) Into the internal operating voltage. External connection of power supply, through the PLC internal equipped with a dedicated switch regulated power supply, ac/dc power supply can be converted to PLC work required by the internal circuit power supply ( Dc 5 v, 12 v, 24 v plus or minus) And as the external input component ( Such as proximity switch) Provide 24 v dc power supply ( Only for the use of input endpoint) PLC, and drive the load power is provided by the user.
Every day of the year, there is some city or town in the world that is changing over to for programmable control systems.
Shenzhen Coolmay Technology Co., Ltd. serves a wide variety of professional markets and industries across the globe. Contact us at Coolmay PLC to find the you have always dreamt of.
Shenzhen Coolmay Technology Co., Ltd. knew if this worked for us, it would work for others, so we took the exclusive product and program and re-developed it to be more accessible to customers.
Obviously, financial return is important in manufacturing plc manufacturers, but I think that's not enough. I think many customers want to support something they really believe in.