S7-300 "RUN" activated but program not running!

I have setup an S7-300 CPU312(32MB) in Step7 Lite.
Have done the following...

* Configured the hardware: CPU312C in Rack0, Slot 2
* Setup three symbols: "TEST_IN" = I124.0, "TEST_OUT" = Q124.0, "TEST_OUT_2" = Q124.1
* Created OB1:Main_Program
* Drawn ladder logic in OB1, which equates to the following in STL:

Network 1:
A "TEST_IN"
= "TEST_OUT"
Network 2:
AN "TEST_IN"
= "TEST_OUT_2"

Click to expand...

I Download everything to the CPU and switch to RUN. The diagnostics show that the CPU is RUNNING with no faults, however I would expect the LED next to output Q124.1 to be lit, until I apply 24V (from same power source as CPU, a PhoenixContact 24v 10A PSU in this case) to I124.0, in which case Q124.1 would go out and Q124.0 would light.

Looks like my program isn't running. Any ideas why?
Cheers
Ian

Open OB1 in the LAD/FBD/STL editor.
Then click the "glasses" to go online.
That will hopefully bring you closer to why it does not run.

..or that the digital output is not wired correctly.

Bingo!
Re-checked my wiring against the PDF Here...
And turned out I had made a wiring mistake.
Thanks for the hint!