S7-Analog input output

Hello friends.
If i want to control speed of pump by signal of loadcell<4-20mA>.
How can i do ?
I use Siemens S7

PID Application?

Hello Watt,
More information would be helpfull but if the
Analogue Output acts such that it changes the Analogue
input it sounds like a clasic PID control application.
Regards...........John

Hello Watt;

What CPU are you planning to use, what input and output modules do you have configured? What control stategy have you decided on? Two-state, Three-state, PID? What is the process you are trying to control?

We need more info to help you. Please tell us about the details of your project; we cannot wor in a vacuum.

In the meantime, here are some links to Siemens manuals that describe the different analog modules for different CPU families:

S7-400 modules:

http://support.automation.siemens.com/WW/skm/pdfviewer.asp?HitsPerSite=10&ehbid=html_76%2Fehb%2F1117740%2Ehtm&query=module+data&lang=en&nodeid=1135762&page=1&view=new

S7-300 modules:

http://support.automation.siemens.com/WW/skm/pdfviewer.asp?HitsPerSite=10&ehbid=html_76%2Fehb%2F8859629%2Ehtm&query=module+data&lang=en&nodeid=10072094&page=1&view=new

S7-200 modules:

http://support.automation.siemens.com/WW/skm/pdfviewer.asp?HitsPerSite=10&ehbid=html_76%2Fehb%2F1109582%2Ehtm&query=s7%2D200&lang=en&nodeid=1113428&page=1&view=new

http://support.automation.siemens.c...s7-200&lang=en&nodeid=1113428&page=1&view=new


Hope this helps,
Daniel Chartier

I plan to use CPU 6ES7314-6CF00-0AB0
control fluids in tank.It have loadcell to check weight of fluids
if i want to show value of fluids in touchscreen and i use signal form loadcell to control Hose pump<Servo drive> for control flow speed in pipe.if i want to make this project how can i do?
if i want to find the example of this application. Where i can find it?


Thank

I think what you need to do first is to configure your module so that it accepts the loadcell signal (4-20ma or 0-10v depends on your weighing device). You then scale the signal in your PLC program. After that its ready to show on HMI. You can decide how to use your signal for control PID or two state. There are a lot of examples but its good to understand how you are going to configure your modules and how the project is going to work. The S7 documentation contains most of the information.

You can use FB41(Standard libriary) for PID control... Highlight it in S7 and press F1, it will give you some useful info about FB41 block...
Chrispen is right, Use HardWare configuration utility from S7 to set up I/O cards and their adresses, so you will be able to read/write to/from them in your program...