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why SLD 5 instead SLD 3?

Created by: ARTIT at: 9/23/2014 5:11 AM (7 Replies)

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9/23/2014 5:11 AM	Rate (0)
ARTIT Posts: 4 Rating: (0)	I am new for STL learner , I have one program I can't understand how is work? this is the program in FB to read the paramater from DB and I would to know also why this Program use SLD 5 instead SLD 3? OPN #Par_DB A "Imp_100ms" = #Status.tb TAR2 T #Bl_adr L 26 T #w94 SLD 5 // Why use SLD 5 L #Index *D T #Adr_src_prms L P##Params T #Adr_tmp_prms PTRF: L DBD [#Adr_src_prms] T LD [#Adr_tmp_prms] L #Adr_src_prms + L#32 // Why use L#32 T #Adr_src_prms L #Adr_tmp_prms + L#32 T #Adr_tmp_prms L #w94 + -1 T #w94 L 0 >I JC PTRF L 0.000000e+000 T #Max_sp_mmin.Mot_pre1 T #Max_sp_mmin.Mot_pre2 T #Max_sp_mmin.Mot_pre3 T #Max_sp_mmin.Mot_pre4
ARTIT Posts: 4 Rating: (0)	Last edited by: Min_Moderator at: 9/23/2014 10:48 AM New subject after splitting from /tf/WW/en/Posts/32107#top
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9/23/2014 6:33 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 12/19/2025 Posts: 3052 Rating: (1062)	Hello ARTIT A pointer is alwaysbit address related, so as mentioned in previous posts, you do an SLD 3 to convert an index number to a pointer address (e.g. an index value of 10 becomes a "10.0" pointer value). If you are dealing with Floating values, you need 4 bytes per value and to cater for this you either - multiply your index value with 4 followed by an SLD 3 OR - do an SLD 5 right away (SLD 2 is the same as multiplying with 4 and SLD 3 converts it to pointer format). As for the "Why use L#32": Done toincrement a pointer value by 32 bits (=4Bytes) to point to the next floating point value. I hope this helps
	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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This contribution was helpful to 1 thankful Users Ehsan_Shiraz

9/24/2014 5:34 AM	Rate (0)
ARTIT Posts: 4 Rating: (0)	Thank you so much Fritz. Do you mean is same if we use SLD 5 or SLD 3 ? Please explian me more what is the different between SLD 3,SLD 4 and SLD 5. Or you can give me the examble.
ARTIT Posts: 4 Rating: (0)
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9/24/2014 10:53 AM	Rate (0)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 11/14/2025 Posts: 1696 Rating: (433)	Hi the SLD shifts all bits by given number i.e. SLD 1 = miltiply by 2 (all bits shifted to left by one bit) SLD 2 = miltiply by 4 (all bits shifted to left by two bits) BEFORE SLD 1 (existing velue) 01000101010101000101110111001011 AFTER SLD 1 (shifted velue) 10001010101010001011101110010110 BEFORE SLD 2 (existing velue) 01000101010101000101110111001011 AFTER SLD 2 (shifted velue) 00010101010100010111011100101100 Note: overflows are copied to CC registers and bits at the right are filled with 0s Hope this helps.

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9/25/2014 3:15 PM	Rate (0)
ARTIT Posts: 4 Rating: (0)	Dear Piotr OPN #Par_DB A "Imp_100ms" = #Status.tb TAR2 T #Bl_adr L 26 T #w94 SLD 5 // Why use SLD 5? in this case to use SLD5 is not only convert to pointer. Is it correct? L #Index *D T #Adr_src_prms L P##Params T #Adr_tmp_prms ======================================================== For SLD 3 I understand they want to convert to pointer but for SLD5 in program above they want to convert to pointer or not? Please help me clear my doubt.
ARTIT Posts: 4 Rating: (0)
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9/25/2014 5:20 PM	Rate (0)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 11/14/2025 Posts: 1696 Rating: (433)	Hi They do two things in one go: - convert the pointer - multiply by 4 because DBD (which occupies 4 bytes) is loaded later The index points to index in array of DBDs so pointer must increase by 4 bytes. the SLD 5 would be equal to L #Index L L#4 *D SLD 3 ... Hope tyis helps

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9/26/2014 4:13 AM	Rate (0)
ARTIT Posts: 4 Rating: (0)	Thank you so muck Piotr.M , I am so clear now about SLD.
ARTIT Posts: 4 Rating: (0)
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3/26/2018 9:15 AM	Rate (0)
Jen_Moderator Posts: 8171 Rating: (174)	New question published by khanamin is split to a separate thread with the subject How it possible direct bool output ?. Best regards Jen_Moderator
Jen_Moderator Posts: 8171 Rating: (174)
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