Nicolas,
If you set 'Output Mode' = 'Pulse', then whenever the counter reaches TC (terminal count), it will output a pulse whose duration is one cycle of the source signal. The alternative is 'Toggle', which toggles the output state upon reaching TC. Some of the timing details are illustrated in section 3-8 in the
manual.
Note in particular that the
trailing edge of the pulse corresponds in time to the toggle. This can matter if your application counts up and down through TC frequently, and you use the output pulse or state for other purposes.
When you set 'Source selection' = 'Other counter TC', then your counter will increment whenever the
adjacent counter reach
es TC. I
think this happens independent of whether that adjacent counter toggles or pulses on reaching TC, or even if it doesn't put any hardware signal on the output pin of the terminal block at all.
The idea of "Other" counter (a.k.a. "Adjacent" counter) is very specific for the 6601. Only the following pairings are allowed: (0,1) OR (2,3).
So if you're setting up CTR 1 with 'Source selection' = 'Other counter TC', it will
always be referring to CTR 0. And if you set up CTR 2, it'll be referring to CTR 3.
Be aware that if your 'Other' counter is a pulse train, there will be 2 TC's per cycle, one corresponding to each edge (each toggle).
-Kevin P.
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