| 摘要 |
The sensor unit (1) of the present invention comprises a housing (2) which is adapted to be mounted on a DIN rail (10) closely one next to another as a sensor unit array, and to be connected to a sensor head (4a and 5a) via a cable (4 and 5). The housing (2) accommodates a sensing circuit system (101, 102; 201 to 205) for achieving a desired sensing function in cooperation with the sensor head (4a and 5a), a first optical communication circuit system (210, 211) including a light emitting device (206) and a light receiving device (207) for conducting an optical bi-directional communication with one of the adjacent sensor units in the multiple sensor unit array, and a second optical communication circuit system (212, 213) including a light emitting device (208) and a light receiving device (209) for conducting an optical bi-directional communication with the other of the adjacent sensor units, whereby the sensor unit (1,1) is enabled to conduct an optical bi-directional communication with each of the adjacent sensor units in the multiple sensor unit array.
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