ABB S800 I/O - I;O Modules

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The I/O modules have open ventilated plastic enclosures. On the front of each I/O
module there are three LEDs (FAULT, RUN and WARNING) indicating the module
status and digital I/O modules have a status LED for each channel, some even two.
One additional LED (OSP) is included on analog output and digital output modules.
I/O modules may be replaced in a fully operational I/O station. Mechanical keying
on modules and MTUs protect I/O modules from being inserted in positions where
they could be damaged by excessive voltage or current. An electronic type
designation ID in each module keeps the I/O module from being taken into
operation by the FCI, if a module’s ID does not match the configured module type
definition in the data base.
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more information.