Abstract: An electromagnetic flow meter includes a measurement tube, an excitation coil, an excitation current supplying unit supplying an excitation current with an excitation frequency fex to the excitation coil, a pair of electrodes disposed inside the measurement tube, a measuring unit measuring a flow based on an emf that arises between the electrodes, a first A/D converting unit that converts the emf to a digital signal, a sampling unit sampling the digital signal, a noise evaluation value calculating unit, based on at least the sample data sampled by the sampling unit, calculating as a noise evaluation value the magnitude of the impact of a noise component owing to adherence of foreign matter to the electrodes upon the measurement of the flow, and an electrode scaling diagnosing unit determining an electrode foreign matter adherence state by comparing the noise evaluation value and a predetermined diagnostic threshold value.

Abstract: An electromagnetic flow meter includes a measurement tube, an excitation coil, an excitation current supplying unit supplying an excitation current with an excitation frequency fex to the excitation coil, a pair of electrodes disposed inside the measurement tube, a measuring unit measuring a flow based on an emf that arises between the electrodes, a first A/D converting unit that converts the emf to a digital signal, a sampling unit sampling the digital signal, a noise evaluation value calculating unit, based on at least the sample data sampled by the sampling unit, calculating as a noise evaluation value the magnitude of the impact of a noise component owing to adherence of foreign matter to the electrodes upon the measurement of the flow, and an electrode scaling diagnosing unit determining an electrode foreign matter adherence state by comparing the noise evaluation value and a predetermined diagnostic threshold value.

Abstract: In a programmable controller linking system, a plurality of programmable controllers are connected to one master controller and sequences of the programmable controllers are programmed using addresses representing optional input/output memory areas. Link tables are prepared by automatically allotting input/output memory areas of the programmable controllers, to the inner relays, with respect to addresses of the respective programmable controllers except for the subject programmable controller, the thus prepared link tables are registered in the master controller, and all the link tables are collected from the respective programmable controllers in the master controller at the link starting time to prepare an editorial link table by collecting common portions of the collected link tables.

Abstract: A programmable sequence controller and a sequence control system including a plurality of such controllers. Each sequence controller includes a program memory for storing a preprogrammed sequence of instructions for controlling a machine or part of a machine in response to the status of the machine or part being controlled. Each controller includes data transfer circuitry for receiving status data from another sequence controller on a common data bus and transmitting its own status data to all of the other sequence controllers on the common data bus. Each sequence controller includes an input-output (I/O) memory and an (I/O) flag memory for storing and keeping track of current status information from each of the plurality of controllers.

Abstract: A programmable sequence control apparatus including a first memory device for storing sequence program instructions, an input/output device, a relay ladder operation device for executing logic operations for a relay ladder circuit having n rows and m columns (wherein n and m are positive integers) in accordance with the program instructions, and a control device for delivering control signals to the relay ladder operation device, is so constructed that the control device includes a memory device for storing contact data and branch data for one column j (wherein j=1, 2, . . .

Abstract: A programmable sequence control apparatus comprises a memory device for storing sequence program instructions, an input/output device for introducing input data and delivering output data therefrom, a ladder operation device for carrying out logic operations for a ladder circuit having n lines and m columns in accordance with said program instructions, and a control device for delivering control signals to the ladder operation device. The ladder operation device comprises a first memory device for storing contact data for each column of said ladder circuit, a second memory device for storing branch data for each column of said ladder circuit, and a gate device for executing logic operations for respective lines in each column based on the results of the logic operations executed for corresponding lines in a previous column, and on outputs from the first and second memory devices for delivering results of the operations for the logic operations of a subsequent column.