Get all computers with IIS role installed using SCOM

Get-SCOMGroup -DisplayName "IIS 2003 c*" | Get-SCOMClassInstance | sort displayname | select -ExpandProperty displayname

Or using ServerManager module
Get-ADComputer  -SearchBase "OU=Windows Servers V2,OU=Servere,DC=ocean,DC=com" -filter * | format-table Name >> server_list.txt

$comp = gc "server_list.txt"
foreach ($entry in $comp) {
 write-host $entry
 Get-WindowsFeature -ComputerName $entry -Name "Web-Server" -ErrorAction SilentlyContinue
}

This one below gets events from event log (from each computer from iis2003.txt file generated in the previous script)

$comp = gc "iis2003.txt"

$path = "c:\temp\logs"

$Oct16 = get-date 10/16/2014

$Oct15 = get-date 10/15/2014

foreach ($entry in $comp) {

$fullname = $path + "\" + $entry + ".txt"

Get-EventLog -LogName system -ComputerName $entry -after $Oct15 -before $Oct16 | Where-Object {$_.eventID -eq '19'} | format-table -wrap >> $fullname

Get-EventLog -LogName system -ComputerName $entry -after $Oct15 -before $Oct16 | Where-Object {$_.eventID -eq '7036' -AND $_.Message -like "The World Wide Web Publishing Service service entered the stopped state."} | format-table -wrap >> $fullname

}