Control Techniques controller, German Control Techniques model, Control Techniques price

The Control Techniques controller is a master command device that controls the starting, speed regulation, braking, and reversing of motors by changing the wiring of the main circuit or control circuit and altering resistance values in the circuit according to a predetermined sequence. It consists of a program counter, instruction register, instruction decoder, timing generator, and operation controller. It serves as the "decision-making unit" for issuing commands, coordinating and directing the operation of the entire computer system. Controllers are divided into combinational logic controllers and microprogrammed controllers, each with its own advantages and disadvantages. The combinational logic controller is troublesome to design and has a complex structure; once the design is complete, it cannot be modified or expanded, but it offers high speed. The microprogrammed controller is easy to design, has a simple structure, and is convenient to modify or expand. To change the function of a machine instruction, only the corresponding microprogram needs to be rewritten; 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 microcode. A specific comparison is as follows: The combinational logic controller, also known as a hardwired controller, is composed of logic circuits and relies entirely on hardware to implement instruction functions.

Control Techniques Controller Introduction

A program consists of several program segments. The instructions for each segment can be designed to be stored sequentially in memory. Therefore, as long as the instruction address register also has counting functionality, it can automatically increment by one during instruction execution to form the address of the next instruction, thereby achieving sequential instruction execution. This method is suitable for computers using random-access memory (RAM) as the main memory. When program execution 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 target program segment. When executing a branch instruction, this address is loaded into the program counter (which acts only as an instruction address register at this point, without counting) as the address of the next instruction, thereby achieving the purpose of branching to a different program segment. Similar methods are used for subroutine calls, interrupt handling, and trap handling. After the widespread adoption of RAM, the overall performance of the second method became significantly superior to the first. Consequently, sequential instruction execution has become the standard approach for mainstream computers, making the program counter an indispensable control component of the central processing unit (CPU).

Control Techniques 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 the instruction or information related to forming the operand address (where the operand address is formed via an address generation circuit). A type of instruction called a branch instruction 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, generating corresponding control levels to fulfill the function of analyzing the instruction. 3) Timing Circuit: Used to generate time marker signals. In microcomputers, time marker signals generally have three levels: instruction cycle, bus cycle, and clock cycle. The micro-operation command generation circuit produces various micro-operation commands required to complete the operations specified by the instruction. The primary basis for generating these commands is the time markers and the operational nature of the instruction. This circuit is essentially the hardware implementation of expressions for various micro-operation control signals (such as the A→L expression mentioned above) and 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 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; the micro-operation command "1" serves this purpose. If a branch instruction is being executed, the address of the next instruction is the target branch address. This address is located in the address code field of the branch instruction and is sent directly to the instruction counter. The microprogrammed controller was proposed because combinational logic design has disadvantages such as being difficult to design, inflexible, and hard to modify or expand.

Control Techniques 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 condensation is present (caused by sudden temperature changes or other factors). (3) Direct sunlight exposure. (4) Presence of corrosive and flammable gases, such as hydrogen chloride and hydrogen sulfide. (5) Large amounts of iron filings and dust. (6) Frequent or continuous vibration, with a 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 maintain the temperature within the specified ambient range, sufficient ventilation space must be provided for the installed equipment, with a gap of more than 30 mm between the basic unit and expansion units. If the ambient temperature exceeds 55 degrees Celsius, install electric fans 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/power lines.

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