| 摘要 |
<p>A programmable controller has an overcurrent detection portion (7), an overcurrent indication portion (9) and a transistor (14) for interrupting a load current at the time of occurrence of an overcurrent are provided in an output circuit portion of the programmable controller. An overcurrent detection resistor (7) is provided in the output transistor circuit (14), and a detected voltage across the resistor is compared with a reference voltage in an overcurrent detection circuit (12) to judge an overcurrent. If an overcurrent is recognized, the overcurrent indication portion (9) is operated, and the base current of the output transistor circuit is controlled to perform protection of the output circuit from the overcurrent. Accordingly, when an overcurrent is flowing and an input signal is in ON state, the output transistor is turned OFF automatically and, the overcurrent state is showed to a user. <IMAGE></p> |
