| 摘要 |
PURPOSE: An apparatus for checking up a discrete signal is provided to check a discrete input/output signal regardless of the kinds of discrete input/output signals. CONSTITUTION: A first relay unit(110) and a second relay unit(120) includes plural ports(111-116,121-126) and coils(117,127). Depending on whether or not the current of the coil flows into the ports, the connection state for the plural ports is changed. A specific signal is outputted through first output module(130) and a second output module(150). An input module(140) displays the inputted signal, and a first end part of the first relay unit is selectively connected to a check object device(200) or the second relay unit. The second end part of the first relay unit is connected to the first output module.
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