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Interroll controller refers to a master command device that controls the starting, speed regulation, braking, and reversing of an electric motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to a predetermined sequence. It consists of a program counter, instruction register, instruction decoder, timing generator, and operation controller. It is the "decision-making mechanism" for issuing commands, i.e., it coordinates and directs the operation of the entire computer system. Controllers are divided into combinational logic controllers and microprogrammed controllers, each with its own advantages and disadvantages. Combinational logic controllers are troublesome to design and have a complex structure; once the design is completed, they cannot be modified or expanded, but they offer high speed. Microprogrammed controllers are easy to design, have a simple structure, and are convenient to modify or expand. To modify the function of a machine instruction, only the corresponding microprogram needs to be recompiled; to add a machine instruction, only a segment of microprogram needs to be added to the control memory. However, it operates by executing a segment of microprogram. The specific comparison is as follows: A combinational logic controller, also known as a hardwired controller, is composed of logic circuits and relies entirely on hardware to implement the functions of instructions.

Interroll Controller Introduction

A program consists of several program segments. The instructions of each program segment can be designed to be stored sequentially in memory. Therefore, as long as the instruction address register has a counting function, it can count during the execution of instructions and automatically add an increment to form the address of the next instruction, thereby achieving sequential execution of instructions. This method is suitable for computers using random-access memory (RAM) as the main memory. When the operation of a program needs to switch from one program segment to another, a branch instruction can be used. The branch instruction contains the address of the entry instruction of the program segment to which the control is to be transferred. When executing the branch instruction, this address is loaded into the program counter (which acts only as an instruction address register and does not count at this time) as the address of the next instruction, thereby achieving the purpose of transferring to the program segment. Subroutine calls, interrupt handling, and trap handling use similar methods. After the widespread adoption of random-access memory, the overall operational effectiveness of the second method is significantly superior to the first method. Consequently, sequential instruction execution has become the standard method adopted by mainstream computers, and the program counter has become an indispensable control component of the central processing unit.

Interroll Controller Structure

1) Instruction Register: Used to store the instruction currently being executed. An instruction is divided into two parts: the opcode and the address code. The opcode indicates the nature of the operation, such as addition or subtraction; the address code provides the address of the operand for this instruction or information related to forming the operand address (the operand address is formed via an address formation circuit). One type of instruction is the branch instruction, which is used to change the normal execution sequence of instructions. The address code part of this instruction provides the address of the instruction to be executed next. 2) Opcode Decoder: Used to decode the opcode of the instruction to generate corresponding control levels, thereby fulfilling the function of analyzing the instruction. 3) Timing Circuit: Used to generate timing signals. In microcomputers, timing signals are generally three-level: instruction cycle, bus cycle, and clock cycle. The micro-operation command generation circuit generates various micro-operation commands required to complete the operations specified by the instruction. The main basis for generating these commands is the timing signals and the nature of the instruction's operation. This circuit is actually the circuit implementation of the expressions for various micro-operation control signals (such as the A→L expression above), and it 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. Typically, instructions are executed sequentially, and instructions are stored sequentially in memory. Therefore, under normal circumstances, 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 target address. This address is located in the address code field of the branch instruction and is directly sent to the instruction counter. The microprogrammed controller was proposed because combinational logic design has disadvantages such as being difficult to design, inflexible, and difficult to modify and expand.

Interroll Controller Installation

When installing the controller, avoid the following locations: (1) Ambient temperature exceeds the range of 0~50 degrees Celsius. (2) Relative humidity exceeds 85% or there is condensation (caused by sudden temperature changes or other factors). (3) Direct sunlight. (4) Corrosive and flammable gases, such as hydrogen chloride and hydrogen sulfide. (5) Large amounts of iron chips and dust. (6) Frequent or continuous vibration, with a vibration frequency of 10~55 Hz and an amplitude of 0.5 mm (peak-to-peak). (7) Shock exceeding 10g (gravitational acceleration). To ensure reliable operation of the control system, programmable controllers are typically installed in control cabinets with protective enclosures to prevent dust, oil, and water splashes. To ensure that the temperature remains within the specified ambient temperature range, there should be sufficient ventilation space for the installed equipment, with an interval of more than 30 mm between the basic unit and the expansion unit. If the surrounding environment exceeds 55 degrees Celsius, install an electric fan for forced ventilation. To avoid electrical interference from other peripheral devices, the programmable controller should be kept as far away as possible from high-voltage power lines and high-voltage equipment. A distance of at least 200 mm should be maintained between the programmable controller and high-voltage equipment and power lines.

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