CPU UNIT OF PLC, SYSTEM PROGRAM FOR PLC, AND RECORDING MEDIUM STORING SYSTEM PROGRAM FOR PLC

A system program causes, as an execution preparation process for a control operation of a PLC, execution of a process for generating a reception buffer for storing received input data, and execution of a process for generating, for each input data referred to by a control program, an input synchronization buffer used by the control program as a reference target for the input data. The system program causes, as an execution control process for the control operation of the PLC, execution of an input copy process for copying the received input data from the reception buffer to the input synchronization buffer corresponding to the input data, and execution of a control program start process for starting execution of the control program. 1. A central processor of a programmable logic controller (PLC) for controlling an object of control , the central processor being configured to control the object by repeating transmission of output data , reception of input data and execution of a control program producing the output data using the input data , comprising:a storage that stores a system program and the control program; anda microprocessor that executes the control program and the system program;a communication circuit that transmits the output data and receives the input data, whereinthe system program comprising, as an execution preparation process for controlling the PLC:a process for producing a reception buffer that stores the received input data in the storage, anda process for producing, for each of the input data referred to by the control program, an input synchronization buffer used by the control program as a reference target for the input data; andthe system program further comprising, as an execution control process for the controlling the PLC,an input copy process for copying the received input data from the reception buffer to the input synchronization buffer corresponding to the input data, anda control program start process for starting an execution of ...

CPU OF PLC, SYSTEM PROGRAM FOR PLC, AND RECORDING MEDIUM STORING SYSTEM PROGRAM FOR PLC

The system program includes, as an execution control process of the control program, an owner-side start process that starts execution of an owner-side control program; a copy process in which, when execution of the owner-side control program ends, a global variable that is rewritten by the owner-side control program is copied from a global variable area to a synchronous buffer corresponding to the global variable; and a referrer-side start process that starts execution of a referrer-side control program. 1. A CPU unit of a PLC controlling a control target , comprising:a microprocessor;a memory; anda communication circuit, whereinthe CPU unit of the PLC is configured to control the control target by repeating transmission of output data, reception of input data, and execution of a control program that uses the input data to generate the output data,the memory store the control program, a system program that controls the execution of the control program, and attribute data of a variable that is used by the control program,the microprocessor executes the system program and the control program that are stored in the memory,the communication circuit transmits the output data and receives the input data,the attribute data include, when the variable is a global variable that is referenced by a plurality of the control programs, information specifying one owner-side control program that rewrites the variable and information specifying at least one referrer-side control program that only references the variable, a process in which a global variable area storing the global variable is generated in the memory; and', 'a process in which, with respect to each referrer-side control program and for each global variable that is referenced by the referrer-side control program, a synchronous buffer is generated in the memory as a reference destination in place of the global variable area when the referrer-side control program references the global variable,, 'the system program ...

CPU OF PLC, SYSTEM PROGRAM FOR PLC, AND RECORDING MEDIUM STORING SYSTEM PROGRAM FOR PLC

A microprocessor controls at least one of a first communication circuit and a second communication circuit such that a first input/output process and a second input/output process are executed in parallel. The first input/output process includes a process outputting output data from a first transfer buffer, through the first communication circuit, to a first instrument in a PLC system bus, and a process inputting input data from the first instrument, through the first communication circuit, to the first transfer buffer. The second input/output process includes a process outputting output data from a second transfer buffer, through the second communication circuit, to a second instrument in a field network, and a process inputting input data from the second instrument, through the second communication circuit, to the second transfer buffer. 1. A CPU unit of a PLC controlling a control target , the CPU unit comprising:a microprocessor;a memory means having a main memory of the microprocessor;a first communication circuit transmitting first output data and receiving first input data with a PLC system bus; anda second communication circuit transmitting second output data and receiving second input data with a field network, whereinthe CPU unit of the PLC is configured to control the control target by repeating transmission of the first output data and the second output data, reception of the first input data and the second input data, and execution of a control program that uses the first input data and the second input data to generate the first output data and the second output data,the memory means is used for storage of the control program and a system program,the microprocessor executes the system program and the control program stored in the memory means,the system program includes a command generating, in the main memory, a calculation buffer in which, accompanying execution of the control program, the first input data and the second input data are read and the ...

CPU OF PLC, SYSTEM PROGRAM FOR PLC, AND RECORDING MEDIUM STORING SYSTEM PROGRAM FOR PLC

A scheduler program includes a command to start execution of a motion calculation program in each motion control cycle, a command to cause a microprocessor to start execution of a first user program in each first user program execution control cycle, and a command to repeat output processing and input processing, start of execution of the first user program, end of execution of the first user program, and start of execution of the motion calculation program in this sequence for every period corresponding to the period of the first user program execution cycle. 1. A CPU unit of a PLC having a motion control function to control motion of a motor , the CPU unit of the PLC comprising:a microprocessor;a memory; anda communication circuit,the CPU unit of the PLC being configured to be capable of repeatedly performing output processing of motion instruction value data and input processing of input data for motion control and executing a motion calculation program for every motion control cycle having a constant period,the CPU unit of the PLC being configured to be capable of repeatedly executing a first user program for every first user program execution cycle having a period of integral multiple of the period of the motion control cycle, the first user program being created according to a purpose of control by a user and comprising processing of providing an instruction required for execution of the motion calculation program,the memory storing a system program and the first user program, the system program comprising the motion calculation program and a scheduler program controlling execution of the first user program and the motion calculation program,the microprocessor executing the system program and the first user program stored in the memory,the communication circuit transmitting the motion instruction value data as at least a portion of the output processing and receiving the input data for motion control as at least a portion of the input processing in each motion ...

CPU OF PLC, SYSTEM PROGRAM FOR PLC, AND RECORDING MEDIUM STORING SYSTEM PROGRAM FOR PLC

A scheduler causes a microprocessor to start execution of a first control program after a communication circuit transmits output data and receives input data in a control cycle following a control circle in which execution of the first control program has ended, and causes execution of an unexecuted portion of the first control program in a control cycle following a control cycle in which execution of the first control cycle has not ended. 1. A central processing unit (CPU) unit of a programmable logic controller (PLC) , the CPU unit comprising:a microprocessor that executes a first control program and a scheduler program, the first control program, when executed by the microprocessor, generates output data using input data, and the scheduler program, when executed by the microprocessor, controls execution of the first control program;a memory that stores the first control program and the scheduler program;a setting unit that determines a period of a control cycle; anda communication circuit that transmits the output data and receives the input data for every control cycle; causes the microprocessor to start execution of the first control program after the communication circuit transmits the output data and receives the input data, in a control cycle following a control cycle in which the first control program has ended; and', 'causes the microprocessor to execute an unexecuted portion of the first control program in a control cycle following a control cycle in which the first control program has not ended,, 'the scheduler program, when executed by the microprocessor,'}wherein the CPU unit is configured to control a control target of the PLC by repeating transmission of the output data, reception of the input data, and execution of the first control program.2. The CPU unit of the PLC according to claim 1 , wherein the first control program further includes a motion calculation program claim 1 , that when executed by the microprocessor claim 1 , calculates an ...

CONTROL DEVICE AND SYSTEM PROGRAM, AND RECORDING MEDIUM

A control device capable of appropriately switching operating modes when multitasking is being performed is provided. A CPU unit is provided with a task executing unit for executing a plurality of tasks in parallel, and for executing each task in cycles based on each task; and a mode switching unit for switching operating modes. The task executing unit is configured in such a manner that when in operation mode, a user program is executed for each task, and when in program mode, a user program is not executed for each task. The mode switching unit is configured in such a manner that the operating mode is switched when a plurality of tasks being executed by the task executing unit are synchronized 19-. (canceled)10. A control device for controlling a control object apparatus comprising:a task executing unit configured to execute a plurality of tasks in parallel with one another and to execute each task in a cycle based on the task, anda mode switching unit configured to switch operation modes of the task executing unit,wherein the task executing unit is configured such that in a first mode, a user program is executed for each task, and in a second mode, a user program is not executed for each task, andwherein the mode switching unit is configured such that upon receipt of a switching instruction for operating modes of the task executing unit, the mode switching unit does not switch the operating modes of the task executing unit until the plurality of tasks to be executed by the task executing unit have been synchronized with each other, and the operating mode of the task executing unit is switched when the plurality of tasks are synchronized with each other.11. The control device according to claim 10 , further comprising:a receiving unit configured to receive a switching instruction for operating modes in the task executing unit,wherein after the receipt of the switching instruction by the receiving unit, when the plurality of tasks which are being executed by the ...

CPU UNIT FOR PLC, PLC-USE SYSTEM PROGRAM, RECORDING MEDIUM IN WHICH PLC-USE SYSTEM PROGRAM IS STORED, PLC SYSTEM, PLC SUPPORT DEVICE, PLC SUPPORT PROGRAM, AND RECORDING MEDIUM IN WHICH PLC SUPPORT PROGRAM IS STORED

A system program includes a procedure library in which at least a procedure for controlling execution of a control program and a procedure for controlling output of output data and input of input data are included. If schedule-building data including execution order specifications for the procedures included in the procedure library is stored in a storage section, the system program causes a microprocessor to execute the procedures included in the procedure library in accordance with the procedure execution order specifications included in schedule-building data. 1. A CPU unit in a PLC configured to control a control target , the CPU unit comprising:a microprocessor;a storage section; anda communication circuit, wherein:the storage section is used to store a system program, a control program, and schedule-building data;the microprocessor executes the system program and the control program stored in the storage section;the communication circuit transmits output data generated through execution of the control program and receives input data to be used in execution of the control program;the system program includes a procedure library in which at least a procedure for controlling execution of the control program and a procedure for controlling output of the output data and input of the input data are included; andif the schedule-building data including execution order specifications for the procedures included in the procedure library is stored in the storage section, the system program causes the microprocessor to execute the procedures included in the procedure library in accordance with the procedure execution order specifications included in schedule-building data.2. The PLC's CPU unit according to claim 1 , wherein:the schedule-building data includes specifications necessary to generate a thread by using the procedures included in the procedure library; andthe system program includes processing configured to generate the thread in accordance with specifications ...

Cpu of plc, system program for plc, and recording medium storing system program for plc

A microprocessor controls at least one of a first communication circuit and a second communication circuit such that a first input/output process and a second input/output process are executed in parallel. The first input/output process includes a process outputting output data from a first transfer buffer, through the first communication circuit, to a first instrument in a PLC system bus, and a process inputting input data from the first instrument, through the first communication circuit, to the first transfer buffer. The second input/output process includes a process outputting output data from a second transfer buffer, through the second communication circuit, to a second instrument in a field network, and a process inputting input data from the second instrument, through the second communication circuit, to the second transfer buffer.

Cpu of plc and recording medium storing a system program for plc

Cpu of plc, system program for plc, and recording medium storing system program for plc

Cpu unit for plc, plc-use system program, recording medium in which plc-use system program is stored, plc system, plc support device, plc support program, and recording medium in which plc support program is stored

CPU of PLC, system program for PLC, and recording medium storing system program for PLC

The system program includes, as an execution control process of the control program, an owner-side start process that starts execution of an owner-side control program; a copy process in which, when execution of the owner-side control program ends, a global variable that is rewritten by the owner-side control program is copied from a global variable area to a synchronous buffer corresponding to the global variable; and a referrer-side start process that starts execution of a referrer-side control program.

CPU of PLC, system program for PLC, and recording medium storing system program for PLC

A scheduler causes a microprocessor to start execution of a first control program after a communication circuit transmits output data and receives input data in a control cycle following a control circle in which execution of the first control program has ended, and causes execution of an unexecuted portion of the first control program in a control cycle following a control cycle in which execution of the first control cycle has not ended.

CPU of PLC, system program for PLC, and recording medium storing system program for PLC

A microprocessor controls at least one of a first communication circuit and a second communication circuit such that a first input/output process and a second input/output process are executed in parallel. The first input/output process includes a process outputting output data from a first transfer buffer, through the first communication circuit, to a first instrument in a PLC system bus, and a process inputting input data from the first instrument, through the first communication circuit, to the first transfer buffer. The second input/output process includes a process outputting output data from a second transfer buffer, through the second communication circuit, to a second instrument in a field network, and a process inputting input data from the second instrument, through the second communication circuit, to the second transfer buffer.