User guide

Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
5
As noted in the previous table, these 1746sc-Series modules provide 1500 V
point-to-point isolation. This point-to-point isolation means:
• shorts, overloads, or noise on one circuit won’t affect devices on other
circuits.
• different power sources can be connected to the same module without
damaging components due to excessive voltage differences between points.
• interposing relays aren’t needed to achieve these benefits, saving space and
simplifying installation.
The 1746sc-OAP8I provides some additional benefits:
• each output circuit is individually fuse protected.
• blown fuses are indicated to the user through an LED and to the logic
controller through the logic controller’s input image table. This allows for
fuse monitoring and smart power-down sequencing of equipment after a
circuit failure.
For more information on the benefits of isolated circuits and other features of
the 1746sc-Series modules, call your local distributor or Spectrum Controls
(425-746-9481).