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Referencing Tags in PLC Program

8/4/2014 5:41 PM	Rate (0)
iMalinko Experienced Member Joined: 7/29/2014 Last visit: 8/21/2025 Posts: 82 Rating: (0)	Hello! I'm creating (what I thought was a simple project) a HMI/PLC comibination project. I'm using a S7-200 PLC with 4 EM-231 expansions, connected to a MP 377 HMI screen. In my WinCC flex project, I have all my tags and references to the IO fields set up so when I have analog signals coming to my PLC, it shows the reading on my HMI screen. The question I have is...how do I reference the tag/address in my PLC program? For example, if I my PLC hardware and I connected an analog signal to "Port A" on my PLC, how do I say that is tag "VW 800" on my HMI, so then VW 800 on my HMI shows the analog reading conencted to Port A?
	Last edited by: SagarDPatel at: 8/4/2014 5:43 PM
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8/4/2014 10:00 PM	Rate (0)
William_B Posts: 5225 Rating: (1204)	SagarDPatel ..The question I have is...how do I reference the tag/address in my PLC program? For example, if I my PLC hardware and I connected an analog signal to "Port A" on my PLC, how do I say that is tag "VW 800" on my HMI, so then VW 800 on my HMI shows the analog reading conencted to Port A? Hi there. Sorry to say, but I got entangled in your question - I will try to answer as I understand your question.. help me out where I have understood wrong. The analog inputs are adressed from AIW0. The next analog input is AIW2. If you have a CPU that already have an analog onboard, that port will be AIW0. If there is no analog inputs there, then port A on the first analog card will be AIW0.. then just count in "+2" from there. You can not change the way the inputs are numbered. So you'll have to work with what the system gives you. I suggest you create a Status Chart an check which port is which with a small voltage source.. if you have any doubts. If you wish to have you panel read VW memory (which is okay to do) then you have to include a move function: AIW0 -- MOVE -- VW800... or even have a calculation convert the AIW to an engineering unit. The analog outputs work in the same way. Does this answer your question? w
William_B Posts: 5225 Rating: (1204)
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8/12/2014 1:51 PM	Rate (0)
iMalinko Experienced Member Joined: 7/29/2014 Last visit: 8/21/2025 Posts: 82 Rating: (0)	Thanks, William. I got it working!

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This contribution was helpful to 1 thankful Users William_B

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