Control & acquisition system

[MrReds]

Hallo to everybody !
Please, I am dealing with following situation:
I have to choose between a system where acquisition system is realized by one brand, while control system is realized by a second one.
The second possibility is to choose a single system, where acquisition & control are realized by a sole brand.
What I have to regulate are valves, electrical motors – by an inverter – and I have to measure temperatures and pressures.
The inlets/outlets are 4-20mA modules , or 0-10V or 24V
Please, has anybody any experience with the case above ?

Can anybody of you suggest me some brands, should it be the case I would contact them ?

Thanks in advance !

 

[jraef]

You do NOT want to attempt to implement a complex (yet very powerful) factory DCS system (as described above) to a relatively simplistic application such as building HVAC automation, it is SERIOUS overkill.

Stick to the Building Automation people you previously described. As to one vendor or separate, keep this scenario in mind:

You have a building in which the occupants call to say they "feel" as though the humidity is high, yet your data acquisition says otherwise. You take manual site measurements and discover that it is indeed high, so something is not working correctly. But the control system is taking it's measurements from the data acquisition system for control setpoints. So, the is it because the control system is not working right, or is the data acquisition wrong? Who are you going to call? Or rather, who are you going to call FIRST?

However, if there is no interaction between the two, i.e. a redundant measurement system, then it probably doesn't matter at all.