ABB CI627 Analog module industrial system controller

Description

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An Active/Standby changeover starts with the TMR Processor checking
to see if a Standby I/O Module is installed. If no Standby I/O Module is
available, the TMR Processor will continue to use the Active Module
and will continue to check for an available Standby I/O Module. Once a
Standby Module is found, the TMR Processor will verify that the I/O
Module is of the correct type, that both module removal switches are
closed, and that the I/O Module is a part of the correct module pair by
using the SmartSlot link. At this point, the TMR Processor will
configure the Standby I/O Module with the same configuration
information as the currently Active I/O Module and place the Standby
I/O Module into the Standby state. The Active Module is then placed in
Proof of testing
Transfer between Active
and Standby Modules
38 Rockwell Automation Publication ICSTT-RM271Q-EN-P – August 2021
the Maintain state (which suspends field loop testing), and any module
specific changeover data is transferred. The Educated light flashes
amber before the Active/Standby changeover takes place, to indicate
transfer of dynamic change over data (COD). The previous Standby
Module then becomes the Active Module and the original Module
becomes Standby. If the currently Active Module does not successfully
complete the self-tests, the TMR Processor will revert it to the Standby
state, and the Module in the Maintain state will revert to the Active
state.
• When both module removal switches are opened on an Active Module,
regardless of the module fault status, the TMR Processor will treat it as
a request to perform an Active/Standby changeover.
Under normal conditions, an Active/Standby changeover will only occur if the
new Active Module is fault free. Under some circumstances, it is desirable to
be able to force a changeover to a known faulted module. This can be
accomplished by opening the module removal switches on the currently Active
Module and pressing the reset push button on the TMR Processor. This will
force the changeover to proceed even if the new Active Module is not fault
free.