ABUS controller, German ABUS model, ABUS price

The ABUS controller is the component that directs the various parts of a computer to work in coordination according to the functional requirements of instructions. It is the neural center and command hub of the computer, composed of three components: the instruction register IR, the program counter PC, and the operation controller 0C. It is extremely important for coordinating the orderly operation of the entire computer. Each functional component within the CPU performs a specific function. The implementation of control components manages the transmission of information between components and the flow of data. The path for transmitting information between many digital components is commonly referred to as the "data path." Where the information starts, which register or multiplexer it passes through in the middle, and which register it finally reaches must all be controlled.

ABUS 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 count during instruction execution, automatically incrementing by one, thereby forming the address of the next instruction and 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 the branch instruction, this address is loaded into the program counter (which acts only as an instruction address register at this time, not counting) as the address of the next instruction, thereby achieving the purpose of branching to a different program segment. Subroutine calls, interrupt handling, and trap handling use similar methods. After the widespread adoption of RAM, the overall operational effectiveness of the second method was significantly superior to the first. 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.

ABUS Controller Composition

1) Control Memory (Control Memory) is used to store the microprograms corresponding to each machine instruction. The decoder is used to form the entry address for the microprogram corresponding to a machine instruction. When the microinstructions of the microprogram corresponding to a machine instruction are fetched one by one and sent to the microinstruction register, the micro-operation commands are issued according to the pre-designed logic, thereby completing the function of that machine instruction. This applies to every machine instruction. 2) The width of the microinstruction directly determines the width of the microprogram controller. To simplify the control memory, measures can be taken to shorten the width of the microinstruction, such as adopting field decoding with single-stage segmented decoding. Obviously, the control field of the microinstruction will be greatly shortened. Some micro-operation commands that need to be generated simultaneously cannot be arranged in the same field. To further shorten the control field, field decoding can be designed as two-stage or multi-stage.

ABUS Controller Wiring

The controller power supply is 50 Hz, 220 V AC ±10%. If a power failure occurs and the interruption time is less than 10 ms, the PLC operation is unaffected. If the power interruption exceeds 10 ms or the voltage drop exceeds the allowable value, the PLC stops working, and all output points disconnect simultaneously. When power is restored, if the RUN input is connected, operation proceeds automatically. The PLC itself has sufficient resistance to interference from power lines. If power interference is particularly severe, an isolation transformer with a ratio of 1:1 can be installed to reduce interference between the equipment and ground. Good grounding is a prerequisite for ensuring the reliable operation of the PLC and can avoid accidental voltage surge hazards. The grounding wire should be connected to the machine's grounding terminal; the basic unit should be grounded. If expansion units are used, their grounding points should be connected together with the grounding point of the basic unit. To suppress interference added to the power supply, input terminals, and output terminals, a dedicated ground wire should be connected to the programmable controller, and the grounding point should be separated from the grounding points of power equipment (such as motors). If this requirement cannot be met, common grounding with other equipment must be ensured, and series grounding with other equipment is prohibited. The grounding point should be as close as possible to the PLC.

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