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Created by: ronin237 at: 4/28/2009 9:38 PM (3 Replies)

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4/28/2009 9:38 PM	Rate (0)
ronin237 Posts: 6 Rating: (2)	Hello All, I am working on getting proficient in Siemens Step 7 programming. I never worked much with the STL. My problem is I cannot find an instruction in all of the documentation I have. At the end of an FC, the program loads a double word from a data block, then loads a Double word "FFFFFF". It then ANDs them. Transfers to a Memory location and Loads 0. After that is the line <>D then an = "Memory Location". Is the <> operator a not equal to? Thanks for your help.
ronin237 Posts: 6 Rating: (2)
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4/28/2009 10:57 PM	Rate (0)
Denilson Pegaia Diamond Member Joined: 9/23/2005 Last visit: 1/14/2026 Posts: 4447 Rating: (1487)	Hi, <>D is a double word comparation (if they AC1 is greather or smaller as AC2 => AC1 is different as AC2). take a look at the manual Statement List (STL) for S7-300 and S7-400 Programming pg 2-3 (start-simatic-documentation-english)
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/29/2009 8:04 AM	Rate (0)
Ayman Elotaify Diamond Expert Joined: 5/28/2008 Last visit: 1/14/2026 Posts: 4522 Rating: (843)	Hello, Here's a link to the STL manual: Statement List (STL) for S7-300 and S7-400 Programming Also you can download a demonstration system from the following link: Demonstration System "The Basic Languages LAD, FBD, STL Regards,
	Ayman Elotaify
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4/29/2009 2:08 PM	Rate (0)
ronin237 Posts: 6 Rating: (2)	Thank you!
ronin237 Posts: 6 Rating: (2)
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