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The diagram below illustrates a simple but important application for Local
Control Function blocks:
The designer has been asked to implement a local deadband controller, residing
in the firmware of the duTec Remote I/O controller, to take over whenever
a watchdog timer timeout indicates that communications from the host may
have failed. In the normal mode, the host decides, based on the input
thermocouple reading and its own control logic, whether a process heater
should be on or off. If, however, a timeout occurs, indicating that the host
has not scanned the value for a specified time, the duTec controller is to
take over, based on a simple deadband control point.
To see how this scheme, and others, can be implemented through the duTec
LCF program generator, you can examine them through the duTec demonstration
program DEMOLCF.EXE. This worked example appears as the file COMMO.LCF when
you download and install the demonstration program. (Return to
lcfread.htm for instructions on downloading
the demonstration software.)
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