Hi,
You don't have syslog messages on the IPS module.
You can enable Events on the IPS and not syslogs.
Refer these for the events retrieval:-
https://supportforums.cisco.com/discussion/11125376/aip-ssm-20-send-syslog-messages
http://www.cisco.com/c/en/us/td/docs/security/ips/7-0/configuration/guide/cli/cliguide7/cli_system_architecture.html
https://supportforums.cisco.com/document/47881/sdee-and-ips
Thanks and Regards,
Vibhor Amrodia