US 8,706,262 B2 · CPU unit of PLC, system program for PLC, and recording medium storing system program for PLC

Abstract

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.

Claims44

Dependent claims

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;
and
a microprocessor that executes the control program and the system program;
a communication circuit that transmits the output data and receives the input data, wherein
the 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, and
a 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;
and
the 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, and
a control program start process for starting an execution of the control program.

8 more elements

A method for transferring data between an input/output process and a control program in a programmable logic circuit (PLC), the method comprising:

storing a system program and a control program;
executing the system program and the control program;
transmitting output data and receiving input data;
generating, with the system program as an execution preparation process, a reception buffer for storing the received input data in the storage, and
generating, with the system program as an execution preparation process, for each 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;
and
the system program causes, as an execution control process for the control operation of the PLC,
executing, with the system program as an execution control process, 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
executing, with the system program as an execution control process, a control program start process for starting execution of the control program.

6 more elements

A non-transitory computer readable medium storing a program that allows a computer apparatus to perform a process for transferring data between an input/output process and a control program in a programmable logic circuit (PLC), the program allowing the computer apparatus to perform:

storing a system program and a control program;
executing the system program and the control program;
transmitting output data and receiving input data;
generating, with the system program as an execution preparation process, a reception buffer for storing the received input data in the storage, and
generating, with the system program as an execution preparation process, for each 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;
and
the system program causes, as an execution control process for the control operation of the PLC,
executing, with the system program as an execution control process, 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
executing, with the system program as an execution control process, a control program start process for starting execution of the control program.

6 more elements

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims44