| 摘要 |
<p>This invention relates to a trace control method for a PC (programmable controller) for debugging a user program in the PC. Trace functions (3), (5) added to a source program (1) trace a plurality of designated signals and store them in memory. Signals necessary for program checking are selected from among this plurality of signals and displayed. Tracing can be made only in a single run and the state of the change of signals can be distinguished clearly.</p> |
