I would like to give one question to the forum
Design one system which can start and stop one output by only using one button and relays nothing else more. Number of relays can be more than 3.
volkangun
I am just kidding
I do it like this in the PLC.
press pushbutton
Increment a word
put a condition : is word=1
set the output
press pushbutton again
the word will be incremented again
put a condition: if word=2
reset the output&move zero to the word.
try it it works
thx
What I made is good only for PLC.If you want to use physical relay
Use step relay.
OSR is one shot relay it function that give you pulse ON for one scan time of the PLC.
Out is any internal relay in the PLC
I is the vertical line between the horizontal lines.
They do make cyclic latching relays (not sure of thier exact name) that latch on & off with a single input. I remember my grandfather had one on his farm back in the 60's for an outside light on the barn, with a pushbutton at the house back door.
A standard contactor with a latching coil add-on deck would also do the same thing.
Your best net would be a smart-relay or micro-PLC which would probably be cheaper to buy & program 1 of them - than to buy, design & wire the bank of general purpose relays needed (and you still might need at least 1 one-shot timer)