Personally I think it absurd that such a simple function uses a microprocessor when a few seconds timing could be done with a handful of analogue components, and leave you with a more serviceable unit that any tech could fix. Would it be close to guess this thing is a urinal flush device? Step up to the plate - break the photoelectric beam - nothing happens - but then when you step down the beam re-seals and water flows? The valvey thing is a solenoid operated valve, and while the board might function as a relay it isn't one. Not sure which component you mean by "relay". What is the nature of the failure? Driver board fails? Or solenoid fails? Device won't turn off? Valve chatters? I think the pot is for timing adjustment, and the dip switch for configuration and possibly some bits used as a multiplier for the time scale. Most PE beams have a relay output - it's a de-facto standard for maximum compatibility with interfacing devices. Each system receives the same amount of solar radiation so energy input is the same. One was connected to a resistance heater and one was connected to nothing. The PE beam has 5 wires - likely to be Pos and Neg supply, and the other three being a relay contact output of Common, Normally Open and Normally Closed. I framed this as a thought problem: Imagine you had two identical closed systems each containing a solar PV array. I don't agree that the pot is for sensitivity adjustment. If ADRT's analysis is right - and his surmises about the optocoupler look right, then the optocoupler kind of implies a triac as the driver stage) and if the driver is indeed a triac then the solenoid does not/ should not have a DC coil, and adding a diode will cause smoke and tears. Keywords- PLC Program, Cascading method, pneumatic. Diode needed only if solenoid is a DC type. The sequence of operation controlled by PLC program is also simulated using Automation studio 5.3 software.
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