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Finding Memory bit Source

Created by: nijam at: 8/25/2008 3:04 PM (6 Replies)

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8/25/2008 3:04 PM	Rate (0)
nijam Advanced Member Joined: 8/8/2008 Last visit: 12/19/2025 Posts: 8 Rating: (0)	Dear All, Can anyone help me to locate the below memory bit source for this attached S7 project? Memory Bits : 1. M920.1 and M920.2 and M920.3 and M920.4 and M920.5.These are active when program running. Attachment Dbmk0504.zip (308 Downloads)

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8/25/2008 3:36 PM	Rate (0)
heut Advanced Member Joined: 11/7/2006 Last visit: 7/19/2024 Posts: 24 Rating: (4)	Hi, You can find them im FC 210, NW 8 L W#16#1 L MW 920 SRW //Shift number is value of ACCU 2-L-L => Shift bits in ACCU 1-L T MW 920 this instruction rotate the bits to the right. checkthe folowing by searching : overlapping accessto memory areas. Goodluck with your project. Barthild

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8/26/2008 5:35 AM	Rate (0)
nijam Advanced Member Joined: 8/8/2008 Last visit: 12/19/2025 Posts: 8 Rating: (0)	Sir, Please can you give mea simple example for this network 8 in order to understand clearly. Thanks, Nijam

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8/27/2008 8:21 AM	Rate (0)
pinpon Posts: 17 Rating: (3)	For help, in the program, make click in instruction SRW, then key F1. (Sorry my english) Attachment example SRW.jpg (324 Downloads)
pinpon Posts: 17 Rating: (3)	Last edited by: pinpon at: 8/27/2008 8:23 AM Last edited by: pinpon at: 8/27/2008 8:22 AM
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8/27/2008 8:58 AM	Rate (0)
Remark Bronze Member Joined: 9/1/2006 Last visit: 10/4/2025 Posts: 193 Rating: (13)	What does it do ? Every time that the "Step" variable becomes TRUE the program will "shift" the bits in MW920 to the right. In FC210 NW7 the bits are initialised M920.7 -> SET Example what happens when "Step" is TRUE M920.7 = TRUE all others are FALSE after 1 shift function M920.6 = TRUE all others are FALSE after nextshift function M920.5 = TRUE all others are FALSE etc. Hope this helps you understand what happens. best regards, Remark

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8/28/2008 8:15 AM	Rate (0)
nijam Advanced Member Joined: 8/8/2008 Last visit: 12/19/2025 Posts: 8 Rating: (0)	Sir, I have tried SHR_W function with S7 300 CPU, but I couldn't succeed. Here you can find the STL. What is the missing components in my program. Thanks. Nijam Network 1 A "I0.0" JNB _001 L W#16#1 L "MW2" SRW T "MW2" SET SAVE CLR _001: A BR = L 20.0 A L 20.0 A "M2.1" S "Q4.0" A L 20.0 A "M2.2" = "Q4.1" A L 20.0 A "M2.3" = "Q4.2" A L 20.0 A "M2.4" = "Q4.3" A L 20.0 A "M2.5" = "Q4.4" A L 20.0 A "M2.6" = "Q4.5" Network 2 A "I0.0" A "M2.7" = "Q4.6"

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8/28/2008 9:39 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Your code is almost correct. 1. Dont forget to initialize MW2 2. SRW is bit-independant. I made same code, but with M0.0 instead I0.0. M0.0 is reseted after every shift, so only 1 shift occurs. A M 0.0 JNB _001 L W#16#1 L MW 2 SRW T MW 2 SET SAVE CLR _001: A BR = L 20.0 A L 20.0 A M 2.1 S Q 4.0 A L 20.0 A M 2.2 = Q 4.1 A L 20.0 A M 2.3 = Q 4.2 A L 20.0 A M 2.4 = Q 4.3 A L 20.0 A M 2.5 = Q 4.4 A L 20.0 A M 2.6 = Q 4.5 A L 20.0 BLD 102 R M 0.0
Aret Posts: 2348 Rating: (265)	Last edited by: Aret at: 8/28/2008 9:40 AM
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