BO AND AO

[milkyway]

What is the difference between binary outputs and analog outputs?
Binary is on and off I am thinking,
Analog outputs is the same but it is more like for a drive?
I'm doing some reading and was wondering.
Also binary and analog variables?

[joey791]

binary is on/off
analog-varies, usually a signal that modifies voltage or ma based on settings

[mechdorn]

Really? Please don't tell me you are actually billing somebody for your time.

[milkyway]

Really? Please don't tell me you are actually billing somebody for your time.

Nope, just like my post said, doing some reading,. What makes u think I am billing for my time??
Pay attention

[J-thetechwizard]

I was interviewing for a local DDC control company here in Buffalo, I didn't have any prior DDC experience but I am versed in HVAC and telecom so I gave it a try!
so I found online a DDC tutorial site that pretty much gives a grass roots explaination of DDC and networks all the way up through BACnet and LON.

Check it out...
http://www.ddc-online.org/Digital-Co...l-Systems.html

BTW...I didn't get the job

[desert guy]

A commonly used analog output signal is 4-20 milli amps or 0-10VDC with the lower end of the signal being scaled as 0% and the upper end as 100% of the signal.
A common use is a signal going to a variable frequency drive to an electric motor.

[zw17]

Binary Output (AKA: Digital) is simply on or off. Example: A control board telling a relay to turn on a fan motor.

Analog output is a variable signal used as a control signal. Example: 0-10vdc from a control board used to tell a VFD how fast or slow to drive a motor. 0vdc = 0Hz, 5vdc = 30Hz, 10vdc = 60Hz, or anything in between.

Now I want you to study up and give me examples of what a BINARY INPUT and a ANALOG INPUT could be used for.

[Elfshadow]

Binary Output (AKA: Digital) is simply on or off. Example: A control board telling a relay to turn on a fan motor.

Analog output is a variable signal used as a control signal. Example: 0-10vdc from a control board used to tell a VFD how fast or slow to drive a motor. 0vdc = 0Hz, 5vdc = 30Hz, 10vdc = 60Hz, or anything in between.

Now I want you to study up and give me examples of what a BINARY INPUT and a ANALOG INPUT could be used for.

Can anyone answer??

[flange]

Binary input typically used for status. typical bo's include airflow switch, safety devices, relay aux contacts. fan proof=binary input closed, ie airflow switch closed.

analog input is a control variable, could be an output off of a tempereature sensor, humidity snesor, airflow station, and other controls that give a variable response. example--an airflow station on an air handler delivering a 4-20ma output based upon differential pressure across the fan inlet cone.

[zw17]

Flange!!!!

I wanted him to answer so he could learn something ya dolt!

[Elfshadow]

Flange!!!!

I wanted him to answer so he could learn something ya dolt!

Which is why I asked before starting to list stuff.

[flange]

ooppsie, thought we were doing training. my bad for sure.

[flange]

ok, well he still needs to learn some things. how do you deal with having a 2-10 volt sensor, but need a 4-20ma input??