Considering Reg D,is the following correct?

ACH is limited to 6 per month. Three per month involves POS (involves a 3rd party) and checks & drafts to 3rd parties. (according to Reg D) Reg D says "no more than 3 of the 6 such transfers may be made by check, draft, debit card, or similar order made by the depositor and payable to 3rd parties". So you could have 6 ACH per month/stmt cycle, but in a month where there is a debit card transaction, you could only have 5. (5 ACH + 1 debit card trans = 6 transfer limit)

Sounds as if you are on the right track. Be sure to verify your system trancode parameters to make sure they are tracking correctly.

Examples:
3 POS + 1 telephone transfer request + 2 ACHs = 6
2 ACHs + 2 checks + 12 ATM withdrawals = 4

Your statement rings true to me, basically acknowledges that a total of six transactions are possible - six ACH, for example. But, when third party transactions come into play, only 3 of those are possible - cutting the ACH to 3, to stay within the overall 6 total.

Someone might help me with this - is it 6 w/d per month, or per statement cycle?

Yes. §204.2(d)(2) ...the depositor is permitted or authorized to make no more than six transfers and withdrawals, or a combination of such transfers and withdrawals, per calendar month or statement cycle (or similar period) of at least four weeks...

Read the emphasized part of Andy's quote CAREFULLY. Don't think that you can multiply the number of allowed transfers if you expand your statement period to quarterly.