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indirect addressing in PLC siemens

Created by: Xeren at: 10/4/2005 4:11 PM (7 Replies)

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10/4/2005 4:11 PM	Rate (0)
Xeren Posts: 5 Rating: (0)	Hello! [:)] Maybe you know how i can make configuration of PLC from Scada using indirect addressing? i mean that all variables will have a address from Scada ! to make system flexible ! thank you [:)]
Xeren Posts: 5 Rating: (0)
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10/10/2005 9:23 AM	Rate (0)
KalaDGT Bronze Member Joined: 9/23/2005 Last visit: 1/10/2025 Posts: 79 Rating: (4)	Hi Xeren, excuse me but pheraps i haven't understand ... You want always the same address (DB,DW) in the exchange area of PLC for all your SCADA porject ? Or you make always the same machine with a bit difference (same operator machine but never identical) I want to try help you Thank you Genky
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10/11/2005 11:30 AM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 1/13/2025 Posts: 4114 Rating: (195)	Topic posted twice. Here the answer of the second Topic: [quote user="Dreminee"] Hello What you can do is the following. Create an interface DB for the scada, then everything regarding to scada is in that DB. This way the systemis clear. Indirect addressing should only be the case when you have no other option. It makes the programm difficult to read for unexperienced users
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10/12/2005 11:30 AM	Rate (0)
CS Moderator Moderator Joined: 9/1/2005 Last visit: 1/13/2025 Posts: 4114 Rating: (195)	New question posted in a new thread. But itbelongs to this: [quote user="Xeren"]Hello! the idea it's make the system that can be configured from SCADA it's mean that in PLC we have a program working with M Variable but which input or output address using for block ,it's will configured from SCADA, For example: In Scada we write M1:=i4.3, M2:= Q7.3..... Mx:= Qx.x ....MWx:=PWx... All that will writing in DB of course. IN PLC We have for example bloc Valve that using Mx Variable that receive or transfer the result to inputs or outputs Hope see your answer soon, best regards.Thanks for your help :)
	My Forum is the place to personalize your profile, track your topics, and maintain content that interests you. Best regards CS Moderator
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10/20/2005 9:17 AM	Rate (0)
Komarek Posts: 4 Rating: (0)	I think that you may declare 2dbs db1: adress - bool variable = true defines that its output area = false input area db2: adress- offset = MD variable example from FC: // All variables are local // setup variables at FC call AN #AdrType1 = #AdrType1 //set AdrType1 to true L 9 T #Adr1 // set Adr1 to 10 L 1 T #Adr2 // set Adr1 to 1 // end of setup L #Adr1 // load Adr1 A #AdrType1 // if adrtype is true = Q JNB _001 T #DestAdr //transfer Adr1 in DestAdr JU _002 _001: T #SourceAdr // else in SourceAdr _002: L #Adr2 A #AdrType2 // same as above JNB _003 T #DestAdr JU _004 _003: T #SourceAdr _004: L P#Q 0.0 // i add offset from DestAdr to the start adr of outputs L #DestAdr +D LAR1 //save in AR1 L P#I 0.0 L #SourceAdr +D LAR2 A [AR2,P#0.0] //copy status of input to the output = [AR1,P#0.0] I checked it and it works, but its very easy sample:). If one valve has more inputs-outputs i would use UDT structure, describing adresses, type of adresses etc.. best regards, David Komarek komarek@satec.cz
Komarek Posts: 4 Rating: (0)
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10/14/2017 4:28 AM	Rate (0)
1985DJ1985 Posts: 7 Rating: (0)	Hello everyone, I'm new to PLC programming and trying to understand Indirect addressing can anyone help me out with why do we use indirect addressing? and whats the easiest way to get familiar with it. I tried to read online but I don't know why I don't get it. Thanks a lot
1985DJ1985 Posts: 7 Rating: (0)
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10/14/2017 11:56 PM	Rate (0)
Piotr.M Platinum Expert Joined: 6/24/2013 Last visit: 1/9/2025 Posts: 1668 Rating: (429)	in short terms any form of indirect addressing is to use address calculated in Runtime there are various modes of indirect addressing - with use of AR registers, also you can use memory double word (memory indirect addressing) and so on. please search help as you could write a book about it!

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10/15/2017 8:14 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/8/2025 Posts: 6858 Rating: (1366)	Dear user, I'm new to PLC programming and trying to understand Indirect addressing can anyone help me out with why do we use indirect addressing? and whats the easiest way to get familiar with it. I tried to read online but I don't know why I don't get it. To add new points, you can find valuable tips on the indirect addressing topic with actual S7-Project in the following file.It shared in the technical forum.It includes important indirect addressing topics in S7 controllers and provides you great insight: Memory indirect addressing Register indirect addressing DB pointer and ANY pointer The Tips and regarding files can be downloaded from (simatic tips.zip).If you want more tips, you can check Hans Berger's books on programming ,online manual of STEP 7 and SIOS for FAQs and forum discussions.It is important to practice this topic for mastering. I hope it helps, hdhosseini
	Last edited by: hdhosseini at: 10/15/2017 8:15:49 PM Demo Channel on Youtube
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