Monitoring method and apparatus using a programmable logic controller
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United States of America Patent
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Mar 25, 1997
Grant Date -
N/A
app pub date -
Mar 30, 1995
filing date -
Mar 31, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for monitoring the operation of a plurality of programmable devices in a system which controls the programmable devices, and corresponding apparatus for monitoring the same. The employs two CPUs. One of the CPUs is controlled to communicate with the programmable logic controller of the system, specifically, to process devices read from the PLC, and to return the result to a two-port memory. The other CPU is controlled to read the result from the two-port memory and display it on the CRT, thus enabling a monitor display, which displays the operation of the programmable device, to have a fast response time.
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