Scaling Temperature Sensor(PLC S7-200)

[raguilas]

Hi everyone I have the following:

1.- PLC S7200
2.- HMI tp177b pn/dp 6"cstn
3.- Temp. transmitter IFM TP9237


2.- HMI tp177b pn/dp 6"cstn(image)
https://www.lagerwerk.com/elektrik-...ch-panel-tp177b-dp-6-mstn-6av6-642-0bc01-1ax1

3.-Temperature transmitter(image)
http://www.ifm.com/products/mx/ds/TP9237.htm
http://www.ifm.com/products/mx/ds/TM4311.htm

I want to create the scale so I can get the temperature value(° Celcius) on the PLC and then read the value from the HMI(tp177b pn/dp 6"cstn) and display it.

So I'm using a library called "scale.mwl"

I already have connected the temp. transmitter correctly, before doing it I cheked the voltage outup value(from the transmitter) with a multimeter and a lighter and could see the voltage variation(0-10V) as the temperature went up/down.

Now, I have no idea what variable or where I should be reading the engineering value from("32000-6400" or "32000-0"?)
I don't know wheter its going to be adressed to AIW2 or VD100.

I also have to select between three block types for scaling: S_ITR, S_RTR or S_RTI, and don't know what's the right option.

Blocks images:
http://i.imgur.com/ta9DVQX.png

The temperature range that I'm going to be using is between 10 to 60°Celcius more or less...(50°F to 140°F), I need the value in celcius

Could you be so kind giving me some orientation please?

Thanks in advance.

Best regards

 

[AustralIan]

Unless you have the I/O-link adapter, in which you can alter the range of the transmitter, the factory default setting is 0-10V = 0-100°C.

As it is 0-10V, your range in the PLC is 0-32000.

S_ITR will scale your input to a real (ie. floating point) value.

Addressing for the inbuilt Analog input on an S7-200 are AIW0 for the first analog input and AIW2 for the second analog input. This is where your 0-32000 integers are located.

After you have done the scaling, you will need to put it in a memory real, that is VD100 or similar. The VD100 address will contain for example 50.3°C

Hope that helps.

 

[AustralIan]

Oh and if you don't want to use the default 0-100, you need an IFM IOLink cable to program the transmitter to a different range, eg 5-65°C.

 

[raguilas]

Unless you have the I/O-link adapter, in which you can alter the range of the transmitter, the factory default setting is 0-10V = 0-100°C.

As it is 0-10V, your range in the PLC is 0-32000.

S_ITR will scale your input to a real (ie. floating point) value.

Addressing for the inbuilt Analog input on an S7-200 are AIW0 for the first analog input and AIW2 for the second analog input. This is where your 0-32000 integers are located.

After you have done the scaling, you will need to put it in a memory real, that is VD100 or similar. The VD100 address will contain for example 50.3°C

Hope that helps.

Thank you for taking the time to reply and helping me AustralIan, I really appreciate it, I'm taking your advice and I'll try it, first thing in the morning at the school lab.

=D

 

[raguilas]

Unless you have the I/O-link adapter, in which you can alter the range of the transmitter, the factory default setting is 0-10V = 0-100°C.

As it is 0-10V, your range in the PLC is 0-32000.

S_ITR will scale your input to a real (ie. floating point) value.

Addressing for the inbuilt Analog input on an S7-200 are AIW0 for the first analog input and AIW2 for the second analog input. This is where your 0-32000 integers are located.

After you have done the scaling, you will need to put it in a memory real, that is VD100 or similar. The VD100 address will contain for example 50.3°C

Hope that helps.

Hi AustralIan

Thanks for your help, I did it the way you told me, and it worked perfectly =)

I created a memory real variable on wincc and it worked just fine, I attach pictures.

Have a great day!

Thank you once again.

Microwin
http://i.imgur.com/x7ntwNW.jpg

WINCC
http://i.imgur.com/8wRnlhv.jpg