Binary to 7 segment decoder - RGYB to 1234

274

03:56:57

Converts  4 24 vdc PLC outputs to warning tower light (RGBY) to Display the alarm color codes 1/2/3/4

1 = A        RED
2 = B        GREEN
3 = A+B    YELLOW (Red + Green)
4 = C        BLUE 

 How to reduce the 24 volt signal to 2 volts ? 

How to  wire ...  
www.electronics-tutorials.ws/combination/comb_6.html

Decoder #  74LS48 for common-cathode (-)LED types

published 8 years ago

genpack

8 years ago

Does anyone have experience with the decoder ? Will the 24 volts on the input side turn it into a smoke bomb ?

bfgstew

8 years ago

Why 24v? Why not use lower voltage, say 5v. Best to consult the decoder data sheet for specific input voltage limits and use of current limiting resistors.

genpack

8 years ago

I have to interface with some industrial PLC outputs, and they are all at 24 vdc

bfgstew

8 years ago

Best thing is to check with manufacturers data sheet then, other than that rig up voltage dividers

bfgstew

8 years ago

http://everycircuit.com/circuit/4666508627410944

BillyT

8 years ago

The decoder is probably logic voltage levels, a din rail 4 pack relay module would be the way to go.

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