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What is controller?
- Jan 19, 2018 -

The controller electric forklift parts refers to the main order in order to change the main circuit or control circuit wiring and change the circuit resistance to control the motor start, speed control, braking and reverse master device. Electric forklift parts consists of a program counter, an instruction register, an instruction decoder, a timing generator and an operation controller. Electric forklift parts is a "decision-making body" issuing a command, that is, to coordinate and direct the operation of the entire computer system electric forklift parts.

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The Main Classification

The controller electric forklift parts is divided into a logic controller and a microprogram controller, and each controller electric forklift parts has advantages and disadvantages. Combinational logic controller design cumbersome, complex structure, once the design is completed, it can not be modified or expanded, but it's fast. Microcontroller controller electric forklift parts design is simple, simple structure, modification or expansion are convenient to modify a machine instruction functions, just re-encode the corresponding micro-program; to add a machine instruction, just add a section of micro-control memory program, However, it is done by executing a few steps. The specific comparison electric forklift parts controller is as follows: Combinational logic electric forklift parts controller, also known as hard-wired controller, composed of logic circuits, complete by hardware to achieve the function of the instruction electric forklift parts.


Working Principle

Electromagnetic sucker controller electric forklift parts: 380V AC voltage step-down transformer, after the rectifier into 110V DC rectifier into the sucker by the control device at this time the sucker was magnetized, demagnetizing access reverse voltage lines, the controller electric forklift parts to achieve demagnetization.


Access Controller electric forklift parts: The access controller electric forklift parts operates under two modes. One is the inspection mode, the electric forklift parts other is the recognition mode. In the inspection mode, the controller electric forklift parts continuously sends the inquiry code to the card reader and receives the reply command of the card reader. This electric forklift parts mode will continue until the card reader card reader. When the reader senses the card, the card reader on the controller's inspection order has a different response, in this reply command, the card reader will read the card's internal code data sent to the access controller electric forklift parts, so that access control Controller electric forklift parts enters recognition mode. In the identification mode of the access controller, the access controller electric forklift parts analyzes the inner code of the proximity card, compares it with the card data stored in the device, and performs subsequent actions. After the access controller electric forklift parts completes the action of receiving data, it will send a command reply card reader to restore the card reader status, meanwhile, the access controller will return to the inspection mode.


Common species

Combinatorial logic

Design steps:

1, the design of the machine's instruction electric forklift parts system: the provisions of the type of instruction, the number of instructions and the format and function of each instruction;


2, the initial overall design: such as register settings, bus arrangements, computing device design, connection between components, etc.;


3, draw the instruction flow chart: Mark each instruction at what time, what components of what kind of operation;


4, scheduling operation schedule: that is, according to the instruction flow chart decomposition of micro-operations for each operation, according to the time period should be listed in the micro-operation of the machine;


5, List micro-operation signal expression, simplify, circuit implementation.


Basic Component:

1, the instruction register electric forklift parts is used to store the executing instruction. Electric forklift parts Instruction is divided into two parts: opcode and address code. The operation code is used to indicate the operational nature of the instruction, such as addition, subtraction, etc. The address code gives the operand address of this instruction or information on the address of the operand (in this case, the address is formed by the address forming circuit to form the operand address). There is an instruction called a branch instruction, which is used to change the normal execution order of the instruction. The address code part of this instruction gives the address of the instruction to be executed.


2, Opcode Decoder: Used to decode the opcode of the instruction, produce the corresponding control level, and finish the function of analyzing the instruction.


3, the timing circuit: used to generate the time signal. In microcomputers, the timestamp signal is typically three levels: instruction cycle, bus cycle, and clock cycle. The micro-operation command generation circuit generates various micro-operation commands that complete the operation specified by the instruction. The main basis for these commands is the operational nature of the time stamps and instructions. This circuit electric forklift parts is actually a circuit implementation of each micro-operation control signal expression (such as the A → L expression above), which is the most complex part of the combinational logic controller.


4, Instruction counter: used to form the address of the next instruction to be executed. In general, the instructions are executed sequentially, and the instructions are stored sequentially in memory. Therefore, in general, the address of the next instruction to be executed can be formed by adding 1 to the current address and the micro-operation command "1" is used for this purpose. If a branch instruction is executed, the address of the next instruction to be executed is the address to which it is to be transferred. The address is in the transfer instruction's address code field, which is sent directly to the instruction counter.