The PLCADD1616 outputs are isolated, dry-contact relays.
That simply means that whatever you put into the common terminal of each output, is what you get out of the N.O. terminal when the output is turned on.
Suppose your up/down contactors have 120VAC coils; and that you want to use the first two outputs on the PLCADD1616 (OUT17 and OUT18) for up and down respectively; that you want to control them with the Aux3 and Aux6 keys on the panel; and that you want the overtravel switches to work, on INP17 and INP18.
In that case:
You would wire one leg of your 120VAC supply (preferably the hot leg) to the first two output commons (first and third terminals).
You would wire from OUT17 (second terminal), through the normally-closed contact of the down contactor (as an interlock), to the A1 coil terminal of the up contactor.
You would wire from OUT18 (fourth terminal), through the normally-closed contact of the up contactor, to the A1 terminal of the down contactor.
You would wire the other leg of your 120VAC supply (neutral) through the normally-closed contact of the overload relay, to the A2 terminals of both the up and down contactors.
You would wire +24VDC to each of the four common terminals on the PLCADD1616 input banks (or at least to the first one).
You would wire 0VDC to the COM terminals on your knee-up and knee-down limit switches.
You would wire the N.C. terminals of your knee-up and knee-down limit switches to INP17 and INP18 respectively.
You would add lines something like the following to appropriate places in your PLC program:
Code: Select all
KneeUpLimitOk IS INP17
KneeDownLimitOk IS INP18
;...
KneeUp IS OUT17
KneeDown IS OUT18
;...
IF Aux3Key && !Aux6Key && KneeUpLimitOk THEN (KneeUp)
IF Aux6Key && !Aux3Key && KneeDownLimitOk THEN (KneeDown)
As an aid to correctly identifying the input and output terminals while wiring, you can print the attached labels and apply them to the green Phoenix plugs.
