I know what I want to do, in English it is..
RWT=Return water temperature
Output is in milliAmps, an AO on the DX9100
If RWT is less than 72°F
Then output 7 mA.
[enables the boilers, which run at their pre-programmed values, proven to work just fine]
If RWT is greater than 80F
Then output 4 mA.
[shuts off the boilers]
(consequently if the the RWT is between those two limits, after reaching the 80F, output 4 mA which means the glycol boilers are turned off. I may never reach 72F on the RWT till next fall when the heat pumps start putting out more cold glycol on the RWT. The boilers currently run too long and hot and I must impose a 'high limit' of 80F to prevent the cooling tower from running at the same time as the boilers. Don't ask me about retuning the boilers, I've gone as far as I can with the manufacturer and I'm stuck with an 18F start/stop range on them.)
I have the hardware AO output point configured already, I can pick 0-20 or 4-20 mA.
I figure two DCO points of 72 and 80F are required.
I'm struggling with the PM of choice for this situation, and the connections.
So how do I configure the PMs in a DX9100?
I can eventually do it with trial and terror, but I'm hoping some of you Johnsons fellows can cut my learning curve down by a lot.