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Converting S5 "DO" instruction to S7

Created by: JBailey at: 3/28/2013 6:16 PM (1 Replies)

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3/28/2013 6:16 PM	Rate (0)
JBailey Posts: 1 Rating: (0)	I need some help converting a "DO" instruction from S5 to S7. I have looked at the examples given in previous threads and while I understand them and the concept of indirect addressing they don't totally answer my needs because they deal with words and my code is using flags. For example: C DB14 . . . L +KH C008 T DW 16 DO DW 16 S F0.0 Or C DB 15 . . . L +KH E0A4 T DW 16 DO DW16 S F0.0 This code is used to set a flag whose byte and bit offsets are in DW16. My problem is how do I decode the Byte and Bit offsets?
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3/29/2013 2:13 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/20/2024 Posts: 3029 Rating: (1058)	Hello JBailey the Byte address for S Flags is in bits 0-11 and the bit address is in bits 12-14 and the attached pic from page 142 of the 948 CPU manual has more on this. What this means in your case is this: KH C008 = S Flag address 8.4 (C = 1100, the most significant bit is ignored, so its 100 = 4) KHE0A4 = S Flag address 164.6 (E = 1110, the most significant bit is ignored, so its 110 = 6) As S Flags will be converted into "normal" M bits in the S7 (S 0.0 becomes M256.0 by default), you'll need to manually adjust the S5 DO command indirect addressing of these. I hope this helps Attachment S Flags structure for DO command.jpg (448 Downloads)
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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