Communication system
First Claim
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1. A communication system comprising:
- a controller that is connected to a plurality of field devices for inputting and outputting an analog signal and a digital signal;
a system computer that is provided in an upper hierarchical layer of the controller, executes an application program, and communicates with one of the plurality of field devices by using the digital signal through the controller;
a path establishing section that selects a field device for communication from the plural field devices, and establishes a virtual communication channel to be a communication path for performing one-to-one communication with the selected field device via the system computer and the controller; and
a converting section that serves similarly as a modem that the application program takes as a premise, and converts a communication signal being transmitted through the virtual communication channel.
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Abstract
A communication system has: a controller that is connected to a plurality of field devices for inputting and outputting an analog signal and a digital signal; and a system computer that is provided in an upper hierarchical layer of the controller, and communicates with one of the plurality of field devices by using the digital signal through the controller. The communication system further has a path establishing section that selects a field device for communication from the plural field devices, and establishes a virtual communication channel to be a communication path for performing one-to-one communication with the selected field device via the system computer and the controller.
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5 Claims
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1. A communication system comprising:
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a controller that is connected to a plurality of field devices for inputting and outputting an analog signal and a digital signal; a system computer that is provided in an upper hierarchical layer of the controller, executes an application program, and communicates with one of the plurality of field devices by using the digital signal through the controller; a path establishing section that selects a field device for communication from the plural field devices, and establishes a virtual communication channel to be a communication path for performing one-to-one communication with the selected field device via the system computer and the controller; and a converting section that serves similarly as a modem that the application program takes as a premise, and converts a communication signal being transmitted through the virtual communication channel. - View Dependent Claims (2, 3, 4, 5)
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Specification