Process control system
First Claim
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1. A process control system, comprising:
- a control unit that executes control computations using a normalized signal as an input value and outputs an operation value; and
a monitoring unit that communicates with the control unit via a control bus, and converts the operation value output from the control unit to a physical unit value scale and displays the operation value;
wherein the control unit includes an input data storage means for associating and storing the input value and engineering unit value scale data as structuralized data, and an operation means for receiving the structuralized data from the input data storage means and computing the operation value;
wherein the operation means supplies the operation value and the engineering unit value scale data to a display means of the monitoring unit.
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Abstract
The present invention has the following characteristics.
The process input signal input value and engineering unit value scale data are associated and stored inside the control unit. The operation value determined from the input value and the engineering unit value scale data are sent from the control unit to the monitoring unit. Accordingly, the control unit and monitoring unit do not hold separate engineering unit value scale data, so the engineering unit value scale data can be centrally managed.
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Citations
12 Claims
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1. A process control system, comprising:
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a control unit that executes control computations using a normalized signal as an input value and outputs an operation value; and a monitoring unit that communicates with the control unit via a control bus, and converts the operation value output from the control unit to a physical unit value scale and displays the operation value; wherein the control unit includes an input data storage means for associating and storing the input value and engineering unit value scale data as structuralized data, and an operation means for receiving the structuralized data from the input data storage means and computing the operation value; wherein the operation means supplies the operation value and the engineering unit value scale data to a display means of the monitoring unit. - View Dependent Claims (2, 3)
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4. A process control system, comprising;
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I/O modules corresponding to I/O points, the I/O modules inputting and outputting I/O data; an input output unit that directs the I/O data passing through the I/O modules; control logic to receive the I/O data passing through the I/O modules and to handle the I/O data; a label definition means for defining variables handled by the control logic using label names; and a correspondence table, which provides correspondences between mount positions specifying the I/O modules, and the label names; wherein the data input and output from the I/O modules are connected to corresponding control logic based on the correspondence table. - View Dependent Claims (5)
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6. A process control system comprising:
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a control logic generating unit comprising a control logic generating means that creates control logic used by a control application, and a label definition means that defines variables handled by the control logic using label names; a control unit comprising a control application execution means, which is generated by downloading data of the control logic generation means, and a correspondence table, which is generated by downloading data of the label definition means, and which provides correspondences between mount positions specifying I/O modules, and the label names; a table maintenance unit that maintains the correspondences between the label names and the mount positions in the correspondence table; and a process input output unit comprising input and output modules for inputting and outputting data; wherein the data input and output from the process input output unit are connected to corresponding control logic based on the correspondence table. - View Dependent Claims (7)
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8. A process control system comprising;
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a PLC means, whose functions are defined by software and which executes a control application; an input interface means that interfaces a signal from a real process to the PLC means; an output interface means that interfaces a signal from the PLC means to a real process; a pseudo input generating means, whose functions are defined by software and which generates a simulated input signal based on a signal from the output interface means; and a real input pseudo input switching means, which, when a simulated input signal is used, supplies the pseudo input generating means with a signal from the output interface means, and supplies the input interface means with the output signal of the pseudo input generating means. - View Dependent Claims (9, 10, 11, 12)
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Specification