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the last water drinker

Siemens Simatic S7-1200 component selection

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Posted (edited)

Hi, 

I am designing measurement devices and i intend to use Simatic S7-1200 as PLC for my new device. The problem is, my background is nothing close the electric and I am having quite a lot troubles when it comes to select components, I do not know how can I select components that are compatible with the PLC i am going to use. 

Pressure sensor, humidity sensor shall be selected and which parameters I should be careful about?

I read somewhere 24VDC supply voltage is needed. Is it needed even the device has digital output or is it for analog output only?

How do I make sure about the communication interface? For some devices it says I2C, is that compatible with S7-1200? or do i need a special communication module for each component? Then it will be super expensive. 

I would appreciate any answer. 

Edited by the last water drinker

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Posted (edited)

Pressure, humidity... these are typically “analog” inputs to a plc. The analog value from the sensor is typically 0-10 vdc , 4-20 milliamp. Others exist, these are the common outputs from these sensors 

your plc system will need an “analog input” for each sensor 

and yes, 24vdc is needed to power the plc and these sensors  

 

Edited by jrw
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