/etc/syslog-ng/syslog-ng.conf configuration

[rayar]

I am using syslog-ng 

the syslog are configured to create a new file every min 

with the below  

destination d_1513 { file("/splunksyslog/port1513/$HOST/syslog_$FACILITY_$YEAR-$MONTH-$DAY-$HOUR-$(/ $MIN 1).log");};

looks like the files are created are large file 

is there an option to create the files every 30 sec for example 

didn't find is possible to set 

destination d_1513 { file("/splunksyslog/port1513/$HOST/syslog_$FACILITY_$YEAR-$MONTH-$DAY-$HOUR-$(/ $SEC 30).log");};

OR 

destination d_1513 { file("/splunksyslog/port1513/$HOST/syslog_$FACILITY_$YEAR-$MONTH-$DAY-$HOUR-$(/ $MIN 0.5).log");};