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RRD Function

Created by: Wijekoon at: 2/16/2013 6:19 AM (2 Replies)

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2/16/2013 6:19 AM	Rate (0)
Wijekoon Posts: 59 Rating: (2)	Dear Member / Expert Please can you simply explain me RRD Function and OB 182, OB250 IN CPU 945? I already refer S5 115U manual but not fund more detail so please help me for this matter. Best Regards
Wijekoon Posts: 59 Rating: (2)
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2/16/2013 7:56 PM	Rate (0)
jklm Platinum Member Joined: 12/22/2006 Last visit: 1/25/2022 Posts: 1742 Rating: (309)	Hello, Be aware that the CPU945 has its own manual http://support.automation.siemens.com/WW/view/en/1086944 RRD stands for Rotate Right Double Word (32 bit) The instruction rotates the contents of ACCU 1 (double word) to the right. Positions becoming vacant are padded with the shifted bits. The result is stored in ACCU 1. ACCU 2 is not affected. OB182 It is a kind of built-in system function (you do not have to program the content of the OB, you just have to call it). If you call it it copies data areas. The usage is to complicated to be explained here. But in the manual, all details are explained, inchapter 2.11.5
	Best regards jklm Suggestion was helpful? Feel free to rate it.
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This contribution was helpful to 2 thankful Users dchartier Wijekoon

2/17/2013 5:31 PM	Rate (0)
Wijekoon Posts: 59 Rating: (2)	Dear jklm Your support highly appreciated Cheers
Wijekoon Posts: 59 Rating: (2)
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