It can be done with a 24volt AC programmable logic relay (PLR) from Siemens or Idec. But it won’t be inexpensive. Each PLR with display costs about $180. You’ll need one PLR for each bay. And, if there are more than 7 functions per bay, 4 point expansion modules are another $80 or so.
The program can “do the math” for you…showing actual dollar and cents values on the device’s display. The function timers can only display full hours and minutes. Both counters and timers can be reset with the push of a button.
Another option is Hobes type electro-mechanical timers and counters…one counter for each bay, and one timer for each bay function. But, at $45 to $50 each, that adds up quickly, too. ($400/bay for 7 functions and
coin counter…but no programming required.)
BTW...if function timing isn't an absolute necessity...one PLR can serve as a digital display
coin counter for up to 8 bays.