What are the various events in which M580 Hot Standby CPU causes switchover.

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Any one of the following events will cause a switchover:

The primary PAC has encountered a blocking condition and entered the HALT state.
The primary PAC has detected an unrecoverable hardware or system error.
The primary PAC has received a STOP command from Control Expert or the DDDT.
An application program is being transferred to the primary CPU.
Primary PAC power is turned off; a power cycle occurs.
The following events simultaneously occur:

The primary PAC loses communication to all RIO drops.
The Hot Standby link is healthy.
The standby PAC maintains communication with at least one RIO drop.

Similar to a switchover, a swap is a controlled event that transfers control of the network from the primary PAC to the standby PAC. A swap can be caused by:

Execution of the DDDT CMD_SWAP command by either program logic, or an animation table Force command.
Manually clicking the HSBY Swap button in the Task tab of the CPU Animation window in Control Expert.