BCD Encoder

[bmoynihan]

Hi,

On a part of plant that I am looking at there is an old BCD encoder connected directly to the PLC. We are wanting a local display to show this output. My question is can the BCD parallel output be split between 2 destinations without loading issues? If not does anybody know of any products or circuits that could do this 'splitting'?

Thanks

Ben

 

[Skogsgurra]

It is all a question of how long, how fast and what power levels. A 24 V signal and PNP output from the BCD is usually not a problem even for a 100 metre distance. NPN may need extra pull-ups to +24 - and then it will probably work over same distance.

TTL is not supposed to travel outside a closed system, but can be made to do so if you use filters and pull-ups. Describe your output and your display in terms of voltages, impedances and distance you want to go. That will make it possible to answer your question.

Gunnar Englund

http://www.gke.org

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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

 

[bmoynihan]

Thanks for your reply,

I don't yet have the information on the system to which the encoder is currently connected. As for the voltages on the output of the encoder, according to their spec they are:-

Vcc = 10.8 to 16V DC

Binary 0 represented by :- 0 to 1.5V
Binary 1 represented by :- 1.5V to Vcc

So if we were to assume that the current system would load the signal too much, can you buy spitters etc to do this?

Thanks,