PURPOSE:To attain selection of input groups with a small number of parts by connecting in common the emitters of photocouplers set in the same input group and providing a driver for an open collector which drives selectively those emitters connected in common for each group. CONSTITUTION:An A-group selection signal AS and a B-group selection signal BS are set at a low level and a high level respectively. Under such conditions, a driver AD for output of an open collector functions to earth emitters of photocouplers AT1-ATN of a group A. While the emitters of photocouplers BT1-BTN of a group B are open and therefore the input signals AI1-AIN of the group A are fetched by common input buses AO1-AON. In the same way, the signals AS and BS are set at a high level and a low level respectively. Thus the input signals BI1-BIN of the group B are fetched by the common input buses AO1-AON. The same operation is carried out also in the case of optional M sets of photocouplers.

Selecting system for digital input group

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Selecting system for digital input group