Abstract: The present disclosure provides a device for processing a programmable logic controller (PLC) program. In one embodiment, the device includes a storage containing PLC programs stored on a block basis, and a program block table defining storage locations of the PLC programs; and a controller configured: when a PLC program is modified during a PLC is operating, to determine a start address of a storage location where the modified PLC program is to be stored with referring to a block number of the modified PLC program, size information of the modified PLC program, and the program block table; and to store the modified PLC program in the storage based on the determined start address. According to the present disclosure, multiple users may simultaneously access a PLC and then may simultaneously modify PLC programs during the PLC is operating.

Abstract: The present disclosure provides a device for processing a programmable logic controller (PLC) program. In one embodiment, the device includes a storage containing PLC programs stored on a block basis, and a program block table defining storage locations of the PLC programs; and a controller configured: when a PLC program is modified during a PLC is operating, to determine a start address of a storage location where the modified PLC program is to be stored with referring to a block number of the modified PLC program, size information of the modified PLC program, and the program block table; and to store the modified PLC program in the storage based on the determined start address. According to the present disclosure, multiple users may simultaneously access a PLC and then may simultaneously modify PLC programs during the PLC is operating.

Abstract: The present disclosure relates to an apparatus for updating an OS (Operating System) in PLC (Programmable Logic Controller) configured to update an OS in a PLC, and to perform an operation by instantly applying the updated OS to the PLC, and a method using the same, the apparatus including an MPU (Micro Processing Unit), a flash memory, a second working memory, and a switching unit.

Abstract: The present invention relates to a method for controlling the operation of a moving average filter, which is capable of optimizing the ability to cope with a surge noise through reasonable control of a tracking speed with respect to a change in an input value. The method includes: (a) a step of setting a stability reference value and a corresponding sampling interval; (b) a step of inputting measurement data; (c) a step of calculating a first moving average using the measurement data input in the step (b) by applying a basic sampling interval; and (d) a step of calculating a second moving average for the measurement data by applying the sampling interval corresponding to the stability reference value set in the step (a) if the first moving average is equal to or larger than the stability reference value.

Abstract: A method for transmitting and receiving data between a micro processing unit (MPU) and a memory operating with different operating voltages in a programmable logic controller (PLC) is provided. In one embodiment, the method includes outputting, by the MPU, a chip select (CS) signal and an address signal to read requested data from the memory, outputting, by an OR gate, an activation signal for activating a data input buffer, the OR gate receiving the CS signal and the address signal, and outputting, by an access signal output buffer, a memory access signal for operation of the memory, the access signal output buffer receiving the CS signal and the address signal. The method further includes outputting the requested data to the data input buffer, and outputting, by the data input buffer, the requested data to the MPU when the requested data is received by the data input buffer from the memory.

Abstract: The present invention relates to a method for controlling the operation of a moving average filter, which is capable of optimizing the ability to cope with a surge noise through reasonable control of a tracking speed with respect to a change in an input value. The method includes: (a) a step of setting a stability reference value and a corresponding sampling interval; (b) a step of inputting measurement data; (c) a step of calculating a first moving average using the measurement data input in the step (b) by applying a basic sampling interval; and (d) a step of calculating a second moving average for the measurement data by applying the sampling interval corresponding to the stability reference value set in the step (a) if the first moving average is equal to or larger than the stability reference value.

Abstract: Provided are a PLC device and a method for controlling the same. The method includes: receiving input data from an external; storing the received input data in an input area of a data input/output unit; reading the input data from the input area of the data input/output unit in order to perform a calculation operation; storing output data, which is a result of the calculation operation, in an output area of the data input/output unit; and transmitting the output data in the output area of the data input/output unit to an output circuit.

Abstract: A method for transmitting and receiving data between an MPU and a memory operating in mutually different operating voltages in PLC is proposed, the method including: outputting, by the MPU, a CS (Chip Select) signal and an address signal in order to read data by approaching to the memory; outputting, by an OR gate, an activation signal for activating a data input buffer by receiving the CS signal and the address signal; outputting, by an access signal output buffer, a memory access signal for operation of the memory by receiving the CS signal and the address signal; outputting, by the memory, data requested by the MPU to the data input buffer by responding to the memory access signal; and outputting, by the data input buffer, the received data to the MPU by receiving the data outputted by the memory.

Abstract: A programmable logic controller (PLC) system, and more particularly, a data processing apparatus and method in the PLC system are provided. In the data processing method in a programmable logic controller (PLC) system, first dummy code data is output to an area having a chip selection signal for valid data output. The valid data is output after the first dummy code data is output. And second dummy code data is output when the valid data output is completed.

Abstract: A method of outputting a positioning pulse by a programmable logic controller (PLC) is provided. The method includes setting up the desired cycle of a pulse to be output; determining a number of needed clocks based on a number of system clocks and a desired frequency according to the desired cycle; determining a total number of needed clocks based on the number of needed clocks and the desired frequency; determining a clock difference based on the number of system clocks and the total number of needed clocks; determining a first number of setup clocks corresponding to a first output pulse in a certain cycle; determining a second number of setup clocks corresponding to pulses except for the first output pulse; and outputting a pulse based on the first number of setup clocks and the second number of setup clocks.

Abstract: A method of outputting a positioning pulse by a programmable logic controller (PLC) is provided. The method includes setting up the desired cycle of a pulse to be output; determining a number of needed clocks based on a number of system clocks and a desired frequency according to the desired cycle; determining a total number of needed clocks based on the number of needed clocks and the desired frequency; determining a clock difference based on the number of system clocks and the total number of needed clocks; determining a first number of setup clocks corresponding to a first output pulse in a certain cycle; determining a second number of setup clocks corresponding to pulses except for the first output pulse; and outputting a pulse based on the first number of setup clocks and the second number of setup clocks.

Abstract: The present disclosure relates to an apparatus for updating an OS (Operating System) in PLC (Programmable Logic Controller) configured to update an OS in a PLC, and to perform an operation by instantly applying the updated OS to the PLC, and a method using the same, the apparatus including an MPU (Micro Processing Unit), a flash memory, a second working memory, and a switching unit.

Abstract: A programmable logic controller (PLC) system, and more particularly, a data processing apparatus and method in the PLC system are provided. In the data processing method in a programmable logic controller (PLC) system, first dummy code data is output to an area having a chip selection signal for valid data output. The valid data is output after the first dummy code data is output. And second dummy code data is output when the valid data output is completed.

Abstract: Disclosed is a communication apparatus and method in a programmable logic controller (PLC). In a communication method, a micro processing unit (MPU) decides whether or not an interrupt signal is generated. When it is decided that the interrupt signal has been generated, the MPU communicates with an external programming and debugging tool (PADT).

Abstract: Provided are a PLC device and a method for controlling the same. The method includes: receiving input data from an external; storing the received input data in an input area of a data input/output unit; reading the input data from the input area of the data input/output unit in order to perform a calculation operation; storing output data, which is a result of the calculation operation, in an output area of the data input/output unit; and transmitting the output data in the output area of the data input/output unit to an output circuit.

Abstract: Disclosed is a communication apparatus and method in a programmable logic controller (PLC). In a communication method, a micro processing unit (MPU) decides whether or not an interrupt signal is generated. When it is decided that the interrupt signal has been generated, the MPU communicates with an external programming and debugging tool (PADT).