Changing analog output into Digital
Posted by Richard Marier on 8/19/2014
to Niagara AX
We all had a project where we needed one or two extra
digital outputs to make it happen…
There are a couple of situation where can take an extra IO
and you justify the expense by telling the client he will have some extra
Sometimes the project requirement will have a 10-15% extra IO required for a job, so you need to add those IO.
Most of the time, you have plenty of analog out left and you
as stuck with adding an IO for only one digital out.
Fortunately there is a new solution for this occasional
The ADA1 and ADA2 from Myo Solution.
The ADA is a compact module that converts the 0 to 10 Volts output
into a digital relay. It uses the output current of the IO to power itself.
The ADA uses between 0.5 to 3.5ma to operate, well under the
4ma of most controllers.
No external power
Because it requires no external power, the module is very
small and will fit directly between the pins on a standard 5mm spacing connector.
You can effectively stack them together on every IO of the
Requiring no external power also mean you can run a two wires
cable from your controller and install the module directly inside the equipment
to be controlled and not have to worry about finding local power .
Since the ADA is not a mechanical relay, it can be used for
pulsing devices or in places that are tight with available space.
For example, it would be possible to shrink wrap the ADA1
and use it inline inside a single gang box behind a wall sensor or thermostat.
With the ADA2, it would be possible to use its two outputs to
control a floating damper motor.
Of course you will need to change some of your programming
if you are intending to use the analog as digital outs.
The Idea is to consider 0 to be OFF and 10V to be ON.
The ADA uses 0 to 3 volts as an OFF signal and anything above 3.1 Volts as an ON.
Overall the ADA1 and ADA2 are a good tool to have in your bag of tricks.
In some cases It can save you from purchasing a complete IO
In other cases it can make it possible to control devices
that would not normally be possible using a regular mechanical relay.
Links to the product detail here:
ADA1 0-10V to relay converter
ADA2 0 to 10V JACE analog to relay converter