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PI data acces

Created by: big_muzzy at: 3/29/2011 10:15 AM (1 Replies)

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3/29/2011 10:15 AM	Rate (0)
big_muzzy Posts: 48 Rating: (0)	Hello! Could anyone list advantages and down sides of ways of accessing PI data. I am reading 5 bytes from PA instruments and I can read from them by means of: L #iLadderID // load HW input address SLD 3 //shift left to match AR1 format LAR1 //transfer addrss to AR1 L PID [AR1,P#0.0] //read status word from address pointed by AR1 T #rVALUE L PIB [AR1,P#4.0] //read status word from address pointed by AR1 T #bySTATUS of by SFC14. Can anyone comment wchich method is more efficient. Any comments welcome.
big_muzzy Posts: 48 Rating: (0)
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3/29/2011 5:20 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	SFC14 in this case is ~10 times slower - counted for ET200S CPU. Hope this helps:^)
Aret Posts: 2348 Rating: (265)
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