S7 help with thermocouples

simadynmaster · Mar 16, 2004

All:

I am trying to figure out how to handle a thermocouple input with the S7-400 system without adding any other hardware. The temperature will only be used on a display screen and it is not affecting the functionality of the logic. I understand how to add the signal to the graphics; however, what type of conversion will have to be made to convert the incoming signal into a REAL signal that can be viewed on the screen as a temperature?

Thanks

DesertDog · Mar 16, 2004

If you are reading it in on a analog card scale 0 to 27648 with 0 to max temp. If you are using a card that reads Temp directly it's probably already temp X 10.

simadynmaster · Mar 16, 2004

I am using the Siemens ET200 modules. The thermocouples are Type K.

JRW · Mar 16, 2004

Whats the part number and I will look it up.

simadynmaster · Mar 16, 2004

7PF10-****

DesertDog · Mar 16, 2004

The raw value should be 0 to 23150 for 0 to 2315.0 in C
The raw value should be 0 to 27865 for 0 to 2786.5 in F

these can be displayed i ProTool as integer tags with decimal position of 1.

From http://www4.ad.siemens.de/dnl/DQyNjMwNQAA_11062613/PI_S7-300_T3_x.pdf

JRW · Mar 16, 2004

According to the manual. The value will come in x10-

So 500.0 deg C will be 5000.
Just like DesertDog said.

JRW · Mar 16, 2004

You beat me to it.

simadynmaster · Mar 16, 2004

I appreciate your help (all of you).

S7 help with thermocouples

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JRW

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