ABB AC 800M

Section 2 Functional Description Hot Swap of CI873
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Hot Swap of CI873
CI873 supports hot swap. The faulty unit can be replaced online, without disturbing
other units connected to the CEX bus.
After hot removal, the connected I/O channels are marked bad and IEC 1131
variables are set to last good value. Following the subsequent insertion, the new
CI873 gets configured automatically.
In case of redundant CI873, after hot removal of primary CI873, the back up CI873
will take over the EtherNet/IP network and establish the I/O connections.
The following conditions exists when the CI873 device is not responding or is not
available in the network:
• The device configuration is skipped, if the CI873 de
vice fails to connect for 3
times. The Unit Status of CI873 /alarm displays Waiting for Hardware
Initialization, until CI873 boots-up.
• During this error status, the I/O value update to the
application stops.
• The error status continues to display Wait
ing for Hardware
Initialization on the CI873, when the cable connected to the CI873 is
removed followed by the hot swap of CI873. During this, the status of the
devices under CI873 is not updated in Control Builder. The error status is reset
on CI873 and the status of devices under CI873 is updated, when the cable is
connected back to the CI873.
The time taken for the CI873 to boot up after a hot insert depends on the hardware
tree, that is, the number of devices connected under the CI873.
The maximum time taken by CI873 for boot-up is 3 minutes. In addition to this
boot-up time, the CI873 takes some time to establish communication
(EtherNet/IP Communication) with the devices configured under it.
The time required for CI873 to boot up shall also depends on the configuration of
the devices after the hot insert. If an device is not physically available, the time
required for configuration increases as it would wait for time-out for the device.
When CI873 is hot swapped, there shall be a re-configuration of all devices
(EtherNet/IP as well as DeviceNet) under it.