| 摘要 |
<p>A communication rate is enhanced in serial communication. A photoelectric sensor system (1) includes a plurality of sensor units (30A to 30F), a PLC (2), and a communication unit (10). The communication unit (10) is connected to the sensor units (30A to 30F) so as to be able to transmit a signal, and the communication unit (10) transmits information received from the sensor units to the PLC (2). Each sensor unit (30) transmits detection information (a light receiving amount) to the communication unit (10) after a respective waiting time (WT) fixed for the respective sensor unit (30) elapses with a synchronization signal, which is transmitted at a predetermined period (T0) from the sensor unit (30) recognized as a master unit in the sensor units (30A to 30F), as a starting point. The waiting time (WT) of each sensor unit (30) is fixed so as to be different from waiting times (WT) of other sensor units.</p> |
