Why do the Cosworth ignition module (BKL3B) have 2 wires to the ECU to pin 24 & 25 ??

I'm busy with wiring a stand alone ECU, but can't figure out why there are 2 wires from ECU to the ignition module, because normally theres only one trigger wiring from ECU to ignition module.

Who can tell me , why this is, and what the difference is between these two wires which go to pin 24 & 25 from ECU?


Regards,

Bas