A customer wants our next machine on a CompactLogix instead of a 1200, so I'm teaching myself Studio 5000 V33 on Emulate before the real one lands. Two rungs:

```
ADD 0.1 0.2 Sum
EQU Sum Setpoint ---( ) Match
```

Sum and Setpoint are REALs, Setpoint has 0.3 in it, and Match never comes on. The watch window shows Sum 0.3 and Setpoint 0.3. Put 0.5 and 0.5 into the ADD against 1.0 and Match comes on straight away.

I built a fresh project in case I'd broken something and got the same, then I tried it in TIA on a 1214C with Real tags and got the same again, so it isn't a Rockwell thing.

Is the Emulate maths broken, or does a real controller do this too? Am I missing something obvious, a status bit on the ADD maybe?