plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
plc
2014年7月31日星期四
The basic scanning of plc cpu
Once the program in the CPU - the PLC and then set to "run" with the application plc module repeated. In addition to executing the program,
plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
plc cpu modules periodically reads the state of the input device, and sends the data to the output device. State of the real world inputs sensed input system (switch, horizontal, etc.), and converts them into values can be used by the CPU, and these values are written to the input table. Application is executed, and the value is written to the output table. Then converted to real-world change in the output value of the output of the system (when the motor is switched on, the valve is opened, etc.)
2014年7月22日星期二
Central Processing Unit CPU
The function of the CPU is to store and run the PLC software programs. It also interfaces with the Co-Processor Modules, the I/O Modules, the peripheral device, and runs diagnostics. It is essentially the "brains" of the ethernet plc.
The CPU, shown in Figure X, contains a microprocessor, memory, and interface adapters.
The items shown inside the cpu module plc and their basic functions are as follows:
The microprocessor codes, decodes, and computes data.
The memory (ROM, PROM/EEPROM/UVPROM,and RAM) stores both the control program and the data from the field devices.
The I/O Interface adapter connects the Co-Processor Modules, the I/O Modules and the Peripheral Device to the CPU.
The CPU, shown in Figure X, contains a microprocessor, memory, and interface adapters.
The items shown inside the cpu module plc and their basic functions are as follows:
The microprocessor codes, decodes, and computes data.
The memory (ROM, PROM/EEPROM/UVPROM,and RAM) stores both the control program and the data from the field devices.
The I/O Interface adapter connects the Co-Processor Modules, the I/O Modules and the Peripheral Device to the CPU.
2014年7月18日星期五
How do plc cpu module work?
PLCs are often defined as miniature industrial computers that contain hardware and software that is used to perform control functions. A PLC consists of two basic sections: the central processing unit (CPU) and the input/output interface system. The CPU, which controls all PLC activity, can further be broken down into the processor and memory system. The plc input module/output system is physically connected to field devices (e.g., switches, sensors, etc.) and provides the interface between the CPU and the information providers (inputs) and controllable devices (outputs).
To operate, the CPU "reads" input data from connected field devices through the use of its input interfaces, and then "executes", or performs the control program that has been stored in its memory system. Programs are typically created in ladder logic, a language that closely resembles a relay-based wiring schematic, and are entered into the plc cup module's memory prior to operation. Finally, based on the program, the ethernet module plc "writes", or updates output devices via the output interfaces. This process, also known as scanning, continues in the same sequence without interruption, and changes only when a change is made to the control program.
To operate, the CPU "reads" input data from connected field devices through the use of its input interfaces, and then "executes", or performs the control program that has been stored in its memory system. Programs are typically created in ladder logic, a language that closely resembles a relay-based wiring schematic, and are entered into the plc cup module's memory prior to operation. Finally, based on the program, the ethernet module plc "writes", or updates output devices via the output interfaces. This process, also known as scanning, continues in the same sequence without interruption, and changes only when a change is made to the control program.
2014年7月13日星期日
About plc cpu hard-wired logic control unit controller
plc cpu control means, is mainly responsible for decoding the instruction, and sends control signals to each instruction to complete execution of each operation.
Simple instructions by plc analog input module consisting of micro-operations, complex instructions have to operate even by a few dozen to several hundred micro-component micro-operations.
Hard-wired logic controller is entirely composed of mini plc logic. After the instruction decoding logic controller through a combination of different gates, the timing signals of different control sequences sent directly to the execution of each instruction operation.
2014年7月11日星期五
plc cpu detailed configuration
Switching capacity: 12 inputs, 8 outputs
MT transistor output type high-speed pulse input (15K)
MR relay output type high-speed pulse input (15K)
2 analog inputs, 2 analog outputs
This paragraph plc soe module series - not with high-speed transistor output pulse output, for driving stepper, servo motors and other equipment, please use the Series Molded plc cpu or FX2N series plate PLC.
2014年7月10日星期四
Introduction plc cpu time control and data processing
plc cpu time control
Time control of the various operations that a plc analog input output module of time. During the execution of an instruction, and at what time to do what action should be strictly controlled. Only in this way, the computer can automatically output module plc methodically.
Data Processing
That data arithmetic and logical operations, or other information processing.
Introduction plc cpu control components
plc cpu control means, is mainly responsible for decoding the instruction, and sends control signals to each instruction to complete execution of each operation.
Simple instructions by plc digital io module consisting of micro-operations, complex instructions have to operate even by a few dozen to several hundred micro-component micro-operations.
Hard-wired logic controller is entirely composed of random logic. After the plc programmable intelligent controller decoding logic controller through a combination of different gates, the timing signals of different control sequences sent directly to the execution of each instruction operation.
Structure plc cpu control components
Structure plc cpu control has two components: one is at the core of the micro-micro stored program control mode; one is hard-wired logic-based profibus module plc structure.
Micro microcode store holding, for each code corresponding to a basic micro-micro-operations, also known as the microinstruction; each instruction is composed of a different plc sequence of events module of microcode, the microcode sequence constituting the microprogram. After the central processor decodes the instruction that certain timing control signals, according to the order given sequence to beat the micro cycle performed by the microcode identified a number of micro-operations, to complete the execution of an instruction.
2014年7月5日星期六
general-purpose registers plc cpu module
plc cpu modules register components, including general-purpose registers, special registers and control registers.
General-purpose registers can be programmable logic controller plc into two types of fixed-point and floating-point numbers, which are used to save the instruction operand registers and operation results.
General-purpose input module plc are an important part of the central processor, most instructions have access to the general-purpose registers. General register determines the width of the internal data path width of the machine, the number of ports can often affect the operation of the internal parallelism.
2014年7月4日星期五
cpu modules plc control unit
cpu modules plc Control means, is mainly responsible for decoding the instruction, and sends control signals to each instruction to complete execution of each operation.
Its structure, there are two: one is at the core of the profibus module plc micro stored program control mode; one is hard-wired logic-based control structure.
Micro microcode store holding, for each code corresponding to a basic micro-micro-operations, also known as the microinstruction; each instruction is composed of a different plc sequence of events module of microcode, the microcode sequence constituting the microprogram. After the central processor decodes the instruction that certain timing control signals, according to the order given sequence to beat the micro cycle performed by the microcode identified a number of micro-operations, to complete the execution of an instruction.
2014年7月3日星期四
plc cpu module Product Description
plc cpu modules comes standard with two RS485 interfaces, optional Ethernet port
High-speed computing and programmable logic controller processing capabilities
Larger user memory space,
PID control to achieve more channels;
Magnetic storage technology digital input plc ultra-long retentive,
Without battery support, data can be saved for up to 10 years;
Iterative AES encryption algorithm to protect users of intellectual property rights;
S7-200 is compatible with the support of STEP7-MicroWIN Programming.
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