Hello there,
I just graudated from university and i am pretty new at PLC . where i work , they asked me to build a system . I want to share this system with you and the steps which i consider (S7 1200). I will be grateful for any help or source.
System : Any liquid flows through an u-shaped pipe with a pump.
Inputs : speed of pump and pressure (bar) Outputs : power of pump and flow
Steps: Read from pressure transmitter ( scaling-unscaling)
Enter set values on HMI ( rpm , bar )
Compare values ? *** i dont know how compare
PID Compact
Proportional control ( move command )
Show outputs on HMI (flowmeter and current )

Maybe i can use PC instead of HMI for C# HMI application .( S7.Net library)

Have a nice day...

 

Hello there,
I just graudated from university and i am pretty new at PLC . where i work , they asked me to build a system . I want to share this system with you and the steps which i consider (S7 1200). I will be grateful for any help or source.
System : Any liquid flows through an u-shaped pipe with a pump.
Inputs : speed of pump and pressure (bar) Outputs : power of pump and flow
Steps: Read from pressure transmitter ( scaling-unscaling)
Enter set values on HMI ( rpm , bar )
Compare values ? *** i dont know how compare
PID Compact
Proportional control ( move command )
Show outputs on HMI (flowmeter and current )

Maybe i can use PC instead of HMI for C# HMI application .( S7.Net library)

Have a nice day...

Hello there,

A sketch/schematic/drawing would be greatly appreciated...

 

Thanks for replying , actually i am at the moment of thinking. I searched for keywords that might use for me on Google . But i tried to draw system at Paint :d

 

Thanks for replying , actually i am at the moment of thinking. I searched for keywords that might use for me on Google . But i tried to draw system at Paint :d

You can use Function blocks dedicated for example like "Compare block " as you asking about it
You will find it in th elibrary of Siemens plc...

Also have a search on the wide web you surely will find response to your questions

By the way we are here in case you need some support..

ControlsGuy25

 

You might want to read post #15 for an overview approach to executing control projects

http://www.plctalk.net/qanda/showthread.php?t=128184

 

read and gather experience from control

 

Firstly thanks for replying to all, i did some works ( proportional valve controlled by user's bar value )
Network_1 ; for (system on)
Network_2 ; a bar value from user (0-16 bar)
Network_3 ; (0-16 bar) to (4-20ma)
Network_4 ; (4-20ma) to Proportional Valve
Is it work ?

Network_2 ,Networ_3 and HMI

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Firstly thanks for replying to all, i did some works ( proportional valve controlled by user's bar value )
Network_1 ; for (system on)
Network_2 ; a bar value from user (0-16 bar)
Network_3 ; (0-16 bar) to (4-20ma)
Network_4 ; (4-20ma) to Proportional Valve
Is it work ?

Network_2 ,Networ_3 and HMI
View attachment 1012
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View attachment 1013
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View attachment 1011

There is no fault about simulation

 

There is no fault about simulation

Hi

Thanks for sharing !

Hope all is working well ! James