Installation 2
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Digital Inputs:
Modules should NEVER be installed or removed with power applied to the I/O
PLEXER.
The source of the discrete signal to be monitored is external to the I/O PLEXER
in most circumstances. The IDC5S digital input dry contact sense module is an
exception. It provides its own current for sensing contact closure. Therefore, an
external supply is not needed. In fact, they can be DESTROYED if an external
source is connected.
The IDC5 and IDC5D input modules are polarity sensitive and operate only
when the “+” terminal is more positive than the “-“ terminal, Polarity does not
affect the performance of the IAC5, IAC5A, or the IDC5S input modules.
Because the field sides of input modules are totally isolated from each other, like
polarities can be wired common to make use of a single power supply.
The wiring and operation of digital input modules can be verified by closing
individual input sensing contacts and observing the change on the nodule status
indicators. They are On when the module input circuit is energized.
Figure 2-20 Digital Input Wiring
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