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| 11/18/2008 5:01 PM | |
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Posts: 487 Rating:
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First of all, if you create PB1, then make sure it is called in OB1 so that it is executed. Normally in 135 system analog IO is addressed between 128 and 255in peripheral area (P area) PY or PW (byte and word)isused for the AI and AO. But it is possibleto use 0-255 as analog area if you want. Since Analog IOs use a word,we normallyuse PW, not PY.L PW is for Analog input and T PW is for analog output. So from the address alone, you can not make out if it is input or an output, you need to see the operation to determine that. Also check the manual for scaling of each analog modules. You can also use the standard blocks from Siemens for scaling, if you have them. Now, CPU 928B has extended IO area called O area. This can be used for additional IOs set using IMs. So guess this is not the case. So you will not use OY in yourprogram. Butfor your info L OY is reading an extended analoginput and T OY is writing to a extended analog output. There are also otheraddress areascalled IM3 and IM4. http://support.automation.siemens.com/WW/view/en/40127 |
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| 12/20/2008 5:33 AM | |
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Posts: 217 Rating:
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Thanks JMJ I got the same problem an now it,s sloved thanks to you. r'gards |
| 2/22/2016 10:25 AM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4812 Rating:
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New question published by amir kei is split to a separate thread with the subject 135u CPU928, how can i checked and forced values in S5 for OWs?. Best regards |
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