Correct. The Function 02 mode permits re-triggering the DELAY-OFF function by applying a momentary trigger pulse to the CH1 port. The key is it must be a momentary pulse. So to review, here's what you have right now:
Turning on one or more ACC ports triggers the FRM01 to generate one DELAY-OFF cycle to the DCSRC. Once an ACC port is turned on, the FRM01 has already done its deed and is sitting with power applied but idle. Turning on additional ACC ports has no effect. This is as expected.
But as you discovered, Function 02 support re-triggering using the CH1 port. This is shown in the revised diagram above. If you simply run the common wire after the diodes into the CH1 trigger port, you will get a trigger for the first siding turned on. But now the signal is "ON" as long as that siding is powered. Turning on additional ACC ports has no effect since CH1 is already "ON". Hence, in earlier posts I asked about your stash of capacitors. One could devise what should be an inexpensive circuit (likely involving capacitors) that would generate a momentary pulse to trigger the CH1 port whenever an ACC port turns on, even if another ACC port is already on.
This is shown in the crude timing diagram. It shows ACC1 turning on which generates a trigger. Then ACC2 turns on which generates another trigger (even though ACC1 already on). ACC1 turns off but no trigger. ACC1 turns on again and generates a trigger (even through ACC2 already ON). Etc.
It's not that the capacitor circuit would be expensive - maybe $1-$2 out-of-pocket to allow 5 or 10 sidings to share a single FRM01. It's just that now you have "loose" components ( capacitors, resistors, whatever) hanging about. Hence using $2 Delay-OFF modules, albeit one per siding, seemed more straightforward.
But I suppose a determined DIY'er who knows which end of a soldering iron to hold could argue it would be a more compact solution, save a few bucks, and maybe have some fun fiddling with electronics along the way. I suspect in the cost saving category, there is undoubtedly a triggerable DELAY-OFF module that is less expensive than the FRM01. If this is something you'd like to pursue I can poke around an FRM01 to see what kind of CH1-trigger signal it needs and probably concoct an inexpensive and easy-to-assemble circuit to use the Function 02 re-trigger capability.
