Sugestions for a good industrial refrigeration book

[Sergei]

Hi, Sergei



Please can you explain this little more in plain english (is this correct expression?)

Why only 2 PLCs, are you familiar with such controls? Do you have some examples?

Are you speaking about SCADA (Supervisory Control And Data Acquisition) system or ....?

Best regards, Josip

This is just idea. First PLC should work as "brain" of refrigeration plant. It determines the best set points and operating strategies, and sends this information to the second PLC for implementation. First PLC just doesn't exist now, because optimization of refrigeration plant is very complicated issue. Contractors, manufacturers, operating engineer choose the set points at best their knowledge(instead of first PLC). Certainly these choices are not optimum.

Sergei

[Peter_1]

I personally think that nowadays PLC's are more then powerfull enough to perform these tasks.

We don't need some redundancy like in airplanes where one PLC controls the other.

There excist also fail safe PLC's (in fact two in one performing the same tasks where there's a switch from the 1st to the 2nd in case of a failure)
Pilz PLC's are a well known name in this field.

The SCADA package is for those who don't know what a SCADA is just a visualisation of all the measured and controlled values in a nice understandable color screen on a computer.
We used twice a SCADA from Citect but Labview is also well known.

we experimented some time with small PLC's from Tri-plc http://www.tri-plc.com/