FGS-223 Input State Opposite to Specification

[AndrewFG 0]

I bought four pieces of FGS-223 on the same date, from the same supplier, and they all appear identical, but one of them has a very weird difference in behaviour from the other three...

 

1) Three of the units are working perfectly according to the specification: when S1 or S2 are connected to 240V, it reports the state = ON, and when S1 or S2 are disconnected, it reports their state = OFF

2) But on the fourth unit the behaviour is the opposite of the specification: when S1 or S2 are connected to 240V, it reports the state = OFF, and when S1 or S2 are disconnected, it reports their state = ON

 

As far as I can tell, all of the units have the same parameter settings too.

 

Question: Is there a way to make the fourth unit behave in the same (correct) way as the other three? Or is this unit physically defective, and if so how can I return it for replacement?

 

[AndrewFG 0]

Ok, I figured it out. It depends on whether the unit is set to Toggle Switch or Toggle Switch Stable..

 

1) in the first case changing the input state of Sn to its opposite will change the state of the output relay Qn to ITs opposite

2) in the second case changing the input state of Sn to its opposite will cause the output relay Qn to follow the state of Sn (i.e. Qn = Sn)