Electrical rack 1756-A13 programmable control system
Product parameters: rack 1756-A13
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The development of industrial production and technology is inseparable from the automatic control of PLC. PLC can be broadly understood as: centralized relay extension control cabinet. In actual production applications, PLC greatly saves the cost of industrial control and strengthens the concentration of equipment. Management and automatic control
1. From the perspective of the composition of the PLC, besides the CPU, memory and communication interfaces, what other interfaces are directly related to the industrial site? And explain its main functions.
(1) Input interface: accept the signal of the controlled device, and drive the internal circuit to turn on or off through the photoelectric coupling device and the input circuit.
(2) Output interface: The execution result of the program is output through the photoelectric coupling device and output component (relay, thyristor, transistor) of the output interface to control the on or off of the external load.
2. Which parts of the basic unit of a PLC are composed? What role does each play?
(1) CPU: The core component of PLC, directs the PLC to perform *** work. Such as accepting user programs and data, diagnosing, executing execution programs, etc.;
(2) Memory: storage system and user programs and data;
(3) I/O interface: the connecting part between the PLC and the controlled object on the industrial production site, which is used to receive the signal of the controlled device and output the execution result of the program;
(4) Communication interface: exchange information with monitors, printers and other devices through the communication interface;
(5) Power supply.
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