News:

  • August 08, 2022, 10:28:15 AM

Login with username, password and session length

Author Topic: isolated analog signal  (Read 792 times)

maciek

  • Sr. Member
  • ****
  • Posts: 93
isolated analog signal
« on: March 24, 2022, 08:30:50 PM »
is the analog signal coming out of the brx plc or the analog madules that you guys have isolated? some of the cheaper dc drives that i like to use require an isolated analog signal.
ideas welcome.

ADC Product Engineer

  • Hero Member
  • *****
  • Posts: 270
Re: isolated analog signal
« Reply #1 on: March 25, 2022, 07:18:07 AM »
What you need is a signal conditioner.

Controls Guy

  • Internal Dev
  • Hero Member
  • ****
  • Posts: 3435
  • Darth Ladder
Re: isolated analog signal
« Reply #2 on: March 25, 2022, 01:08:38 PM »
The onboard BRX analog is floating.    I recently had an app that will field with a variety of unknown existing VFDs, and I was concerned that some might need a floating analog, so I asked BobO and he said they were.

Although, if you have multiple drives connected to the same module, isolators is a better idea.
I retract my earlier statement that half of all politicians are crooks.  Half of all politicians are NOT crooks.  There.

maciek

  • Sr. Member
  • ****
  • Posts: 93
Re: isolated analog signal
« Reply #3 on: April 02, 2022, 11:21:20 PM »
what does floating analog mean?

Controls Guy

  • Internal Dev
  • Hero Member
  • ****
  • Posts: 3435
  • Darth Ladder
Re: isolated analog signal
« Reply #4 on: April 02, 2022, 11:31:14 PM »
It's a differential signal without a fixed reference to ground.  If you wire it to a receiver that is referenced to ground, and the voltage is non-zero, the signal will "float" to meet it and nothing will burn up. Same type of signal you'd get from a signal isolator or signal conditioner.
I retract my earlier statement that half of all politicians are crooks.  Half of all politicians are NOT crooks.  There.

BobO

  • Host Moderator
  • Hero Member
  • *****
  • Posts: 5708
  • Yes Pinky, Do-more will control the world!
Re: isolated analog signal
« Reply #5 on: April 03, 2022, 12:50:38 PM »
Not related to the question, but we are prototyping a redesign of Host analog that will eliminate the FPGA. Think it has a fairly decent chance of working, and if so, we'll fast track production.
"It has recently come to our attention that users spend 95% of their time using 5% of the available features. That might be relevant." -BobO

Controls Guy

  • Internal Dev
  • Hero Member
  • ****
  • Posts: 3435
  • Darth Ladder
Re: isolated analog signal
« Reply #6 on: April 03, 2022, 05:45:15 PM »
Excellent news!   Thanks for working on that!  Fingers crossed.

Similar specs to the current Host product?
I retract my earlier statement that half of all politicians are crooks.  Half of all politicians are NOT crooks.  There.

BobO

  • Host Moderator
  • Hero Member
  • *****
  • Posts: 5708
  • Yes Pinky, Do-more will control the world!
Re: isolated analog signal
« Reply #7 on: April 03, 2022, 11:57:35 PM »
Excellent news!   Thanks for working on that!  Fingers crossed.

Similar specs to the current Host product?

Ideally identical. Analog section the same. Processor and backplane redone, but should be comparable.
"It has recently come to our attention that users spend 95% of their time using 5% of the available features. That might be relevant." -BobO

maciek

  • Sr. Member
  • ****
  • Posts: 93
Re: isolated analog signal
« Reply #8 on: April 05, 2022, 07:24:06 PM »
so to be sure and excuse my ignorance, what you are saying is that i can  take the brx plc onboard analog out signal and wire it directly to one of my kb drives
that require an isolated analog signal and i will not blow anything up? BOB O