Dear all,

I'm working on a fish farm monitoring system and i'm planning  to use SIMATIC S7-1200 (CPU 1212C DC/DC/DC) as the main controller for this project. I am having trouble in selecting the sensors (temperature and dissolved oxygen) to proceed further. i have done a prototype of this project with Arduino micro-controller using DS18b20 digital temperature  sensor wihich operates at  5V is it possible to use this sensor the with the PLC? please be kind enough share some information regarding temperature sensors (cheaper the better) and dissolved oxygen sensors which are compatible with PLC s7-1200.

Thank you very much. 

hi

You can have 0-10V analog input for S7 1200.or convert the voltage signal to 4-20mA signal.

Hi,

Thank you very much for replying. I used the digital DS18b20 sensor (https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwik0p2lmvzhAhWNCysKHa97D14YABAAGgJzZg&ohost=www.google.co.th&cid=CAESEeD2LHrYKYbNXo3luolVPEze&sig=AOD64_3dgCVtAk7Bt1yf74n2THF3a1Xskg&q=&ved=2ahUKEwi0vpalmvzhAhXObn0KHRfDAlEQ0Qx6BAgLEAE&adurl=) in the prototype of my project using an Arduino micro controller will this sensor be compatible with S7-1200. Can you please let me know some common temperature sensors used with this PLC.

Thank you very much.

Hi!

DS18b20 will not work with S7-1200. It is a digital temp sensor and works at max 5.5 V dc voltage level trough 1-Wire interface.

You should consider Profinet or Modbus devices for this project or if it is a low-budget one, you could keep the Arduino and send sensor data to the PLC trough Modbus/TCP.

 Hi,

Thank you very much for the reply. means a lot to me the project is i'd say a low budget one for now. And we are planning to doing improvements for it later this year. I will read thoroughly on the technical side of the PLC S7-1200 and check on the Price af the temperature sensor  that you mentioned.

Thank you 

mopS04

hi devilman1069,

The easiest way would be to use sensors, that are compatible with the interfaces of your CPU.

The S7-1212 has 2 integrated analog input(0-10V). You can expand your CPU with 2 signal-modules and 1 signal-board that gives you more inputs and outputs. You can use analog signal-modules for temperature-measuring using RTD(PT100...) or thermocouples for example.

Have a look into the S7-1200 system manual

You will find the technical data of all available modules in chapter A.

hope this helps,

regards,

 Hi!

Thank you very much for helping me clarify the doubt on DS18b20's compatibility with S7-1200 the project is low budget and planning on improvements later...I will do a detailed study to understand how to connect the Arduino with the PLC with Modbus/TCP. Or will try to increase the budget to buy the required  sensors. thank you very much kahl. I will update you my progress.

Cheers,

Kahl

Hi!

DS18b20 will not work with S7-1200. It is a digital temp sensor and works at max 5.5 V dc voltage level trough 1-Wire interface.

You should consider Profinet or Modbus devices for this project or if it is a low-budget one, you could keep the Arduino and send sensor data to the PLC trough Modbus/TCP.

Hello devilman1069,

search for LMx35.

Datasheet LMx35

Hello,

maybe I recommend basic AI sensor signal types, on S7-1200 without other AI module, it has Voltage 0-10V input signal/s. With other type of AI modules (check f.ex. HW catalogue) you can measure also Current, 0-20mA or 4-20mA ranges. Due this info you can look for different sensor types on web. In case of sensor with communication interface, this is completely other problematic.

Update: ok, my answer was for today's same post but moved here...

 Hi!

mops04 i want to know if its possible to connect a single Thermocouple/RTD using the two analog inputs in the plc itselt rather than buying extra modules... Please be kind enough to tell me about this matter..i just need to measure the temperature of the system in which the fish farm....and im a beginner to the plc world and improving on it  . 

Thank you very much for your help.

mopS04

hi devilman1069,

The easiest way would be to use sensors, that are compatible with the interfaces of your CPU.

The S7-1212 has 2 integrated analog input(0-10V). You can expand your CPU with 2 signal-modules and 1 signal-board that gives you more inputs and outputs. You can use analog signal-modules for temperature-measuring using RTD(PT100...) or thermocouples for example.

Have a look into the S7-1200 system manual

You will find the technical data of all available modules in chapter A.

hope this helps,

regards,