How can I get a triggered subsystem (samples a Simelectronics circuit) to output on the same cycle it's triggered.

I want a triggered subsystem containing a matlab function block to output on the same cycle it's triggered. Currently the Sample and Hold blocks I'm using to sample the circuit and feed into the subsystem stay at 0 unless I delay the output of the subsystem using either a unit delay block, or a rate transition block. This then causes the subsystem to output the previous calculated output, instead of the current one. Any help would be greatly appreciated.