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analog input not reading

3/13/2014 1:13 PM	Rate (0)
joebez73 Regular Member Joined: 1/31/2014 Last visit: 8/29/2025 Posts: 4 Rating: (0)	Dear all, i have a 315-2 pn/dp cpu with 2 sm331 ai8x12 bit analog cards wired for 4 wire transducer 4-20mA. switches set to c and all wired and configured correctly. I am using portal v12 programed in LAD. I have mA input to card but my iw is reading 0 i have read on the forums that a prefix of :p is needed but when i try this the software wont allow it, may be for previous versions. I have attached a screen shot of part of my function block. My ai's start at ai336 to ai356 with the rest deactivated. If anyone has any suggestions help would be greatly appreciated. Attachment analog fb.jpg (489 Downloads)

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3/13/2014 1:21 PM	Rate (0)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 11/14/2025 Posts: 1696 Rating: (433)	Hi You have 346 in FB call. in description You said the AI start from 336 Maybe this is the problem Also when address is outside of provess image You may need to use PIWxxx to read address directly, without using process image. Regards PM
	Last edited by: Piotr.M at: 3/13/2014 1:22 PM
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3/13/2014 1:58 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, i have read on the forums that a prefix of :p is needed but when i try this the software wont allow it Just type PIW336 and TIA will change it into %IW336:P for you. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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3/13/2014 2:34 PM	Rate (0)
joebez73 Regular Member Joined: 1/31/2014 Last visit: 8/29/2025 Posts: 4 Rating: (0)	yeah 336 is further down fb couldn't fit all on snapshot

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3/13/2014 2:46 PM	Rate (0)
joebez73 Regular Member Joined: 1/31/2014 Last visit: 8/29/2025 Posts: 4 Rating: (0)	Thanks Marcjan now have the :p will test it out when on site

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