Installation 2
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Digital outputs:
Modules should never be installed or removed while power is applied to the I/O
PLEXER.
ODC5, ODC5A, OAC5, and OAC5A digital output modules are used to switch
external power supply loads on and off.
Because they contain a protective reverse diode, the ODC5 and ODC5A output
modules are polarity sensitive and operate correctly only when the “=” terminal
is more positive than the “-“ terminal. A DC digital output module connected
backwards conducts current through its protective diode and appears to be
uncontrollable, it is. Polarity does not affect the performance of OAC5 and
OAC5A digital output modules.
Because the field sides of output modules are totally isolated from each other,
like polarities can be wired common to make use of a single power supply.
It should be noted that the status indicator only follows the logic instruction to
the modules and does not show that the module, its fuse, or external power is
present. Outputs can only be truly verified by monitoring the output with a
multimeter, oscilloscope, or by employing a digital input module as a feedback
tool.
Figure 2-21 Digital output Wiring
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