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User Manual MON20/20 Software for Gas Chromatographs
3-9000-745 SEPTEMBER 2010
3-28
3.4.4 Inverting the polarity of a discrete input
The Invert Polariy option reverses the way a voltage signal is
interpreted by the discrete input. By default, the Invert Polarity option
is set to Normally Open, which means that a low voltage signal is
interpreted by the discrete input as ON, and a high voltage signal is
interpreted by the discrete input as OFF. Setting Invert Polarity to
Normally Closed means that a low voltage signal is interpreted by the
discrete input as OFF, and a high voltage signal is interpreted by the
discrete input as ON.
To set the polarity of a discrete input, do the following:
1. Select Discrete Input... from the Hardware menu. The Discrete
Inputs window displays.
Figure 3-19. The Discrete Inputs window
2. Select Normally Open or Normally Closed from the drop-down
menu under the Invert Polarity cloumn.