| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a monitor data collecting device which is connected with a plurality of display monitoring devices 2 collecting monitor data (PLC data) from each programmable controller (PLC) 1 via LAN 4, and which collects the monitor data for each of a plurality of monitoring points to be stored in a common file 12 from the display monitoring device for a designated collection period from each designated point at a prescribed interval, and writes the plurality of pieces of monitor data for each monitoring point in the common file in real time without an error by a monitor data collecting device 100 with monitoring software 11 for transmitting an open request of the common file at each start point of the collection period of the monitor data for each monitoring point before receiving the monitor data at the interval and transmitting the received monitor data and writing request, and transmitting a close request to close the common file at each end point of the collection period. <P>SOLUTION: A save thread 15 refers to a value of a reference counter 16, and only the open and close requests transmitted by the monitoring software are validated in a state where the collection period of the monitor data for each monitoring point is not actually overlapped. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
