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Hello,

That's a generic error from PHP:

http://stackoverflow.com/questions/14902554/fastcgi-process-exceeded-configured-activity-timeout

http://stackoverflow.com/questions/23148813/how-to-address-the-fastcgi-process-exceeded-configured-request-timeout-error

About LibreOffice, please check that IIS can access the files to be transformed, the destination folder has read and write access and the IIS user can call apps:

http://stackoverflow.com/questions/21613616/php-exec-on-a-windows-with-iis-configuration

http://stackoverflow.com/questions/2294034/how-to-get-shell-exec-to-run-on-iis-6-0

http://serverfault.com/questions/250499/cgi-error-from-php-when-running-exec-on-iis

And check php.ini, maybe passthru is disabled:

https://www.experts-exchange.com/questions/27701669/PHP-passthru-and-exec-problems-on-new-server.html

Maybe you could do a quick try using Apache, as it's easier to configure.

Regards.