to bring the topic to a completion, here's the solution
var PAC3 = msg.payload.PAC3;
var msg1 = {};
var msg2 = {};
var Bel;
var Ent;
if(PAC3 < 0 ) {
Bel = (PAC3 * -1);
Ent = 0;
msg1.payload = Bel;
msg2.payload = Ent;
msg1.topic = "Beladen";
msg2.topic = "Entladen";
} else {
Ent = PAC3;
Bel = 0;
msg1.payload = Bel;
msg2.payload = Ent;
msg1.topic = "Beladen";
msg2.topic = "Entladen";
}
return [msg1,msg2];