| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect the occurrence of an abnormality during stand-by sequence processing and to execute alarming by judging the abnormality when time is up in a timer and the measurement temp. of a temp. sensor is not within the fluctuation permitting range of setting temp. SOLUTION: When the target value (setting temp.) of control temp. is set by a digital switch 14, the target value is stored in RAM 22, the flags of the stand-by sequence processing is set in a flag area 22a, the fluctuation permitting range of the target value is set and it is also stored in RAM 22. While flagging, an alarm output is stopped so as to execute the stand-by sequence processing even when measurement temp. from the temp. sensor 23 is lower than the lower limit value of setting temp. The timer 27 measures a set checking time including a stand-by time from a control start till the first alarm-off point. When time is up in the clocking, the flags of the flag area 22a are reset, the stand-by sequence processing is released and, besides, the measurement temp. of the temp. sensor 23 is read.</p> |
