CONTROL SERVER, CONTROL TERMINAL, CONTROL SYSTEM, AND RECORDING MEDIUM STORING CONTROL COMMUNICATION PROGRAM

摘要

Screen data created by an image processor (74) of a control host computer (7) is transmitted to a programmable display device (5). Based on the screen data, the programmable display device (5) queries a PLC (3) about the state of a device (21) to update display and transmit control instructions according to an input result. An applet that a compiler (76) produces by compiling the screen data is transmitted to a client device (9) through the Internet (32) by an open server (77) of the control host computer (7). The client device (9) executes the applet, sends the open server (77) an inquiry and control instructions similar to those from the programmable display device (5), and updates a display according to a response. A control system is realized for remotely checking the display contents of the programmable display device (5) without redrawing.