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AO module faillure

Created by: salah21250 at: 4/7/2011 10:08 AM (2 Replies)

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4/7/2011 10:08 AM	Rate (0)
salah21250 Posts: 18 Rating: (0)	hi any body Ihave a problem with AO module in Siemens PLC with S7 300 CPU.the problem is when we simulate different values of AO from Operation station the current out put don't followfor exemple: value 0% the out put is 4 MA 25 % the out put is 8 MA 50 % the out put is 12 MA 75 % the out put is 16 MA 100 % teh out put is 20 MA but for some others valuesfor exemple we have. 49 % the out put is 0 MA 47 %the out put is 0 MA 35% the out put is 0 MA the valve wich is connected to this AO is checked and it's OK. and when we connect a resistor 250 Ohm in the place of valve the same problem apear ( we have 0 MA for the same points). some one can help us please.
salah21250 Posts: 18 Rating: (0)
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4/7/2011 11:26 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hope i understand you correctly, if you do 25 %, 50 % etc. it works fine, but if you do 35 % it doesn't work ? That must be a calculation going wrong somewhere in the program. Please attach the relevant program parts, so wee can have a look. Best 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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4/7/2011 12:46 PM	Rate (0)
salah21250 Posts: 18 Rating: (0)	thank very much! but before it worked normaly, and i don't do any change in the program best regards
salah21250 Posts: 18 Rating: (0)
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