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Indirect addressing in and out of a FB

Created by: dande74 at: 3/19/2007 3:31 PM (3 Replies)

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3/19/2007 3:31 PM	Rate (0)
dande74 Posts: 101 Rating: (11)	Hi! I have a FB wich I have called eleven times. Since it's using the same instance DB I have been thinking if it's possible to use indirect addressing and only call the FB one time. The reason thatI use the same instance DB is that I can stick to oneWinCC flexible project. I think you will understand what I want to accomplish when you look at the attached pdf. Regards -- Daniel Attachment Indirect addressing STEP 7.pdf (632 Downloads)
dande74 Posts: 101 Rating: (11)
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3/20/2007 10:50 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	First idea - write these 3 outputs in some memory bits - for example M0.0, M0.1 and M0.2. Then you can multiplex these variables with indirect addressing. This is NOT good coding example - but it's quite simple and you can see whether it was what you meant or not. //Making pointer according L #Station_number L 21 -I L 3 *I SLD 3 // Making overall pointer L P#62.0 +D T #q_pointer // this is DWORD variable A M0.0 = Q[#q_pointer] L #q_pointer L P#0.1 +D T #q_pointer A M0.1 = Q[#q_pointer] L #q_pointer L P#0.1 +D T #q_pointer A M0.2 = Q[#q_pointer]
Aret Posts: 2348 Rating: (265)
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3/20/2007 11:23 PM	Rate (0)
GJohn Posts: 112 Rating: (10)	Add two integersinputs to your FB: iStartOutputByte iStartOutputBit In the FB code you can use the integers to set up a start address for your indirect addressing: L 3 L #iStartOutputByte SLW L #iStartOutputBit OW LAR1 //LOGIC FOR bActValve_1_1 = Q [AR1,P#0.0] //LOGIC FOR bActValve_1_2 = Q [AR1,P#0.1] //LOGIC FOR bActValve_1_3 = Q [AR1,P#0.2] I hope this gives you some ideas. If you need more help, can you explain what other differences there are between the 11 block calls.
GJohn Posts: 112 Rating: (10)
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3/21/2007 8:14 AM	Rate (0)
dande74 Posts: 101 Rating: (11)	Thanks for all suggestions. I will test it within a few days. Don't have the time right now. I will write feedback about how it went as soon as I have tried it. -- Daniel
dande74 Posts: 101 Rating: (11)
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