From PLC product line perspective

   From PLC product line perspective, Nanda proud extension NA400 and NA200 two existing series. NA400 series PLC is mainly used in all kinds of engineering automation, especially in the petrochemical industry, coal mining, rail transportation, plc analog input output io module  water conservancy and hydropower, plc analog input modules building automation, environmental protection, municipal and other areas;  plc controllers  NA200 series PLC, mainly in the field of automation engineering with NA400 series of product applications, focusing on logic control of packaging machinery, food pharmaceutical machinery, lifting machinery, engineering machinery, textile machinery and other fields.

unnecessarily detailed analysis of the internal circuitry of the CPU

In the user view, unnecessarily detailed analysis of the internal circuitry of the CPU, but each part is working mechanism should be enough to understand. CPU CPU controller controls the work,plc analog input modules which it reads the instruction, plc communication module  the instruction interpretation and execution of instructions. However, the pace of work is controlled by the oscillation signal. Operator used for digital or logic operations, working under the command of the controller. Register to participate in operations, and store intermediate result of the operation, input output module plc  it is also working under the command of the controller.
CPU speed and memory capacity are important parameters for the PLC, which determines the operating speed of the PLC, IO, and the number of software capacity, etc., thus limiting the size of the control.

In a redundant function implementation

In NA400 series PLC products, CPU401-0501 product is its representative products, which in addition to all NA400 series PLC as providing safe and reliable operation of  china programmable logic controller the system to all intelligent I / O design and a range of security, reliability, designed for protection, plc analog input modules but also with hardware redundancy. In a redundant function implementation, analog io module to achieve a complete scan of all data exchange, redundant communication rates up to 100 Mbps, users do not need any programming work and hot standby module, you can achieve redundancy, while hot-swappable replacement module can be flexibly applied to a single chassis and dual redundant system chassis redundant systems.

In order to control the system is reliable

In order to control the system is reliable, usually Plc logic controllers installed in a protective housing of the control cabinet to prevent dust, oil, water splashing. intelligent plc  In order to ensure that its temperature is kept within the specified temperature range, install the machine should have enough ventilation space, there must be more than 30 mm spacing between the base unit and expansion unit. input output module plc If the surrounding environment over 55 degrees Celsius, to install the fan, forced ventilation.
In order to avoid electrical interference with other peripherals, programmable controller should stay away from high-voltage power lines and high voltage equipment, should leave at least 200 mm of distance between the programmable controller and high-voltage equipment and power lines as possible.