ABB CI626 Analog module industrial system controller

Description

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Input Module faults are reported to the user through visual indicators (LEDs)
on the Front Panel of the Module. Faults are also reported via status variables
that may be automatically monitored in the application programs, and
external system communications interfaces. There are generally two types of
faults that must be remedied by the user; external wiring and module faults.
External wiring faults require corrective action in the field to repair the fault
condition. Module faults require replacement of the Input Module.
The input circuits of the Module may be used to detect field wiring faults in
addition to alarm states. To achieve this, line monitoring components must
be fitted to the field device.
By comparing the input signal from the field with pre-configured alarm
thresholds, the Module can automatically detect field wiring faults. When a
field signal fails open or short circuit, or to an intermediate value, the input
channel status LED will flash red (default setting). The corresponding input
state will be reported and the line fault status for that channel will be set to ‘1’.
All other input channels will be unaffected, except in the case of common
cause wiring faults in the field.
Once the field wiring fault has been identified and corrected, the input status
and the input status LED will display the normal on/off status of the field
device and field wiring.
Extensive diagnostics provide the automatic detection of module faults. The
TMR architecture of the Input Module and the diagnostics performed ensure
the validity of all critical circuits. Using the TMR architecture provides a fault
tolerant method to withstand the first fault occurrence on the Module and
continue normal input measurements without interruption in the system or
process. Faults are reported to the user through the Healthy status LEDs on
the Front Panel of the Module and through the INFO and HKEEPING
variables. Under normal operations, all three Healthy LEDs are green. When a
fault occurs, one of the Healthy LEDs will flash red. It is recommended that
this condition is investigated and if the fault is within the Module, it should be
replaced.
Module replacement activities depend on the type of spare module
configuration chosen when the system was configured and installed. The
Module may be configured with a dedicated Companion Slot or with a
SmartSlot for a spare replacement Module