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Word to Bit instruction

Created by: solex at: 4/8/2009 12:23 AM (5 Replies)

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4/8/2009 12:23 AM	Rate (0)
solex Posts: 5 Rating: (0)	Is there a way for me to read the bitof a word? Is there an instruction that will allow me toexamine thebitsof a word? Essentially, exchanging data between two PLCs. For example, when low pressure is detected atPLC 1, it will set bit 0 to true. Data is readby PLC 2 as PIWxxx. I want to examine the value of bit 0 of PIWxxx. Is this possible?
solex Posts: 5 Rating: (0)
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4/8/2009 3:18 AM	Rate (0)
playerslight Posts: 1064 Rating: (72)	Hello Solex the easy way to look at the bit level of the piw is L piwxxx t mwxxx then you can look at any bit you would like My question is how are the 2 plcs communicating with each other?
playerslight Posts: 1064 Rating: (72)
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4/8/2009 9:48 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	More complicated solution, but without additional memory requirements L PIW.... AW W#16#1 // mask for 0 bit is 1, if you need 5th bit for example it would be W#16#20 L 0 ==I JC bit0 // bit0=0 => jump to handler JU bit1 // bit0=1 => jump to another handler
Aret Posts: 2348 Rating: (265)
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4/8/2009 8:11 PM	Rate (0)
solex Posts: 5 Rating: (0)	Via profibus.The master (S7-400) is configured to read 8 word and send 8 word from the slave (S7-224). Sorry, but what is the L instruction? Seems to be loading PIWxxx to MWxxx. Is this the same as a move instruction?
solex Posts: 5 Rating: (0)	Last edited by: solex at: 4/8/2009 8:14 PM
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4/9/2009 6:43 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	MOVE = L .... T.....
Aret Posts: 2348 Rating: (265)
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4/10/2009 10:26 PM	Rate (0)
solex Posts: 5 Rating: (0)	Got it. Thnx for the help
solex Posts: 5 Rating: (0)
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