Relay StateΒΆ
A Relay State of 0 indicates the relay is OPEN (off). A Relay State of 1 indicates the relay is CLOSED (on). Note that 0 means the relay is open whether or not the relay is normally open or normally closed (For a normally open relay, the relay is ENERGIZED when it is in state 0 and DE-ENERGIZED when it is in state 1.)
REPORTING THE RELAY STATE.
Boolean actuator actors report when they send an actuation command to its driver so that the SCADA can add this to information to be sent up to the AtomicTNode.
Boolean actuator actors read the state of their relay, when possible.
Note that a reading of the state of the actuator may not mean the relay is in the reported position. For example, the NCD relay requires two power sources - one from the Pi and one a lowish DC voltage from another plug (12 or 24V). If the second power source is off, the relay will still report being on when it is actually off.
Note also that the thing getting actuated (for example the boost element in the water tank) may not be getting any power because of another relay in series. For example, we can throw a large 240V breaker in the test garage and the NCD relay will actuate without the boost element turning on. Or the element could be burned out.
So measuring the current and/or power of the thing getting actuated is really the best test.