Comparison of tags in WinCC 2008 application

ProTool, WinCC flexible, WinCC, PP/OP/TP/TD/MP
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jamesd556
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Joined: Tue Feb 11, 2020 1:14 pm

Comparison of tags in WinCC 2008 application

Post by jamesd556 » Fri Apr 03, 2020 1:11 am

Hi,

As part of a college assignment on developing a simple HMI application for control of a VSD and motor in WinCC Flexable 2008 I've been asked to show a the status of the motor in text, I am trying to use a symbolic IO filed with a text list but I need to show the following values;

If the motor is stopped: Stopped
If the motor is running at less than 75% of the setpoint: Starting
If the motor is running greater than or equal to 75% of the setpoint: Running

I have 2 memory words; MW10 and MW20

MW10 is the setpoint of the VSD on a scale of 0 - 100

MW20 is the feedback from the VFD again converted to a scale of 0 -100


What is the best way to display the correct value in the IO field / text list?

I can't seem to find any default tool that will allow me to do a comparison of 2 MW tags.

Is the best approach to do the comparison in a script and output the result on a single-digit that can be used in a text list?

Thanks, James

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