Let's stay on this TIMING thing, a bit more:
So impulse #1, that was put into the 'Box Input', and goes, internally, directly to set (that box's) 'B' switch.
In the string or series string network, impulse #1 serves to SET the next box, from (expiring) current.
Impulse #2, that's where channel 'B' outputs, again internally only, the 'command', as it were, to SET the 'A' switch.
I'm figuring, by the way, sending BASE CONTROLLER knows which station / which delay or pulse length, etc to use.
At 50Sec. each, 4 stations should be OK at 200 mSec delay, before assuming you can start timing, plus whatever action time, for switching the network components, that it.
So that is saying, at Station 4, when you want to impulse one of the internal switches, your Electric Motor impulse should last, at least 200 mSec + 300 mSec, for best reliable switching.
So, STEP #3:). Now that channel 'B' had SET channel 'A' to active, and assuming you've done all of that 'custom' output from channel 'C', now it's time to send out, to next BOX, a SELECT for local hand-off.
Step #3 is kind of complicated:
It sends, out via the 'LOCAL' shaft, to SELECT next
It parallel sends, via LOCAL, to RESET the channel 'B' switch, right here in this box, but also,
It uses the 'Saturation Overflow' to accomplish RESET
back around the loop, as that reset takes away the power that is doing all this (that's switch 'A' being active).
So, that's a few steps, but, aside from any complexity with channel 'C', the actual impulses are simply, 'B', for 500 mSec and then 'A' for 500 mSec.
If no activity for 'C' output, it takes a pair of those, to get down to each next network box.