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FB12 Bsend and FB13 BRCV inside a single FB?

Created by: TEBANCH at: 6/11/2010 12:31 AM (11 Replies)

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6/11/2010 12:31 AM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (19)	Hello dear colleagues. Maybe i'm asking something imposible ;but i know you are great engineers, and perhaps somebody have an answer for this: I want to create a single FB (FB100) wich will contain both FB12 and FB13, the issue that i can not solve is: How to transfera input parameter of FB100,called"DataArea"tothe SD_1 (FB12)and RD_1 (FB13)parameters? Since they are of type "Any", and they are limited to "M" and "DB" memory areas i have not finded a way to do it. For example in FB100: P#DB10.dbx byte 10 ----> DataArea (Input parameterof FB100 of type any) Inside FB100: DataArea---------------------->SD_1 (input parameter of FB12 of type Any) DataArea---------------------->RD_1 (input parameter of FB13 of type Any) I will apreciate any tips and advices about how to acomplish this task; thanks all you and have a very nice day.
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6/11/2010 3:33 PM	Rate (1)
Aret Posts: 2348 Rating: (259)	Well, nothing impossible here. FB12 and FB13 (for ex. BS_inst: STAT : "BSEND" and BR_inst: STAT : "BRCV" ) can be incapsulated in FB100 for example by means of multiinstance mechanism ( i guess you already knew that:^). Now you want to define input variable DataArea : ANY and then transfer it's content to both SD1 and RD1. Let's go i little back - when using ANY variables in IN/OUT (as well as POINTER or STRUCTURE or another complex type) mechanism is following: You call in OB1 your FB100 with DataArea := P#DB1.DBX0.0 BYTE 5. Actually ANY pointer is represented by 10 bytes (in this example 10 02 0005 0001 84000000 -look ANY data type in Step7 help for details). These 10 bytes is written in LOCAL area of calling block (OB1 in our case) - for example from L22.0 to L31.7.On calling this local addressing is passed to FB - actually 4 bytes instead of 10 ( P#V22.0). Now inside FB you need to copy 10 bytes beginning with 22.0 from local stack of calling block to internal variables BS_inst.SD_1 and BR_inst.RD_1. I guess easiest way is making variable MyAny: TEMP :ANY and // save DB numbers and registers here L P##DataArea LAR1 L P##MyANy LAR2 L W[AR1,P#0.0] T W[AR2,P#0.0] L D[AR1,P#2.0] T D[AR2,P#2.0] L D[AR1,P#6.0] T D[AR2,P#6.0] then just call CALL BS_inst SD_1:= MyAny .... Actually there are much easier ways:^) My example is just explaining internal mechanics, not pretending to be the best one - you will find it by yourself:^)
Aret Posts: 2348 Rating: (259)
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6/11/2010 6:28 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (19)	Hello Aret. Thanks a lot for your reply; i understand almost all of your suggestios and explanations right now i'm in the way to test the method you suggest, but i did not undertand what does mind: (in this example 10 02 0005 0001 84000000 -look ANY data type in Step7 help for details). Is that a aplication note or a FAQ? Or where should i loock for this reference? And also please can you explain me a litle bit more abou how "MyAny" Variable Should be initiated,wich parameter of OB1 or FB100 shoul i send to "MyAny"? Thanks a lot for your help; and have a very nice day.
	Last edited by: TEBANCH at: 6/11/2010 6:52 PM Keep working!
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6/12/2010 12:26 PM	Rate (1)
Aristotelis Posts: 147 Rating: (34)	Hi TEBANCH (in this example 10 02 0005 0001 84000000 -look ANY data type in Step7 help for details). Is that a aplication note or a FAQ? Or where should i loock for this reference? Actually, the Step7 help comes up as soon as you click on menu Help -> Contents in SIMATIC Manager. Write "ANY" in the box and press enter. An alternative would be to read Appendix A.3.4.5 in the Programming with STEP 7 V5.4 manual. Hope this helps.
Aristotelis Posts: 147 Rating: (34)
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6/13/2010 7:18 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (19)	Hello dear colleagues. I have follow the tips you have provided me, but i sill have not completed the task described in the first post, until now i have sucessfully tested FB12/FB13, and also i have builded a FB (FBX) able to transfer a input parameter (of type ANY), to other input parameter (also of type ANY)of another FB (FBY) that is inside of FBX.When i make the same for FB12/FB13 i can not get FB12/FB13 Running, i think they do not run because the Error bit goes to 0 and also the Status paramenter shows 0 always, the Done bit also Stays in 0. In the Attached file thereis FB100 in each PLC, wich is Siemens example FB for use of FB12/Fb13 i have tested with anyproblems,also in the file isFB200, wich is FB200 modified by me to acomplish the task of this post, i call them on OB1. Pleasewould you like to take a loock to FB200 tocheck what i'm doing wrong? I will apreciate anyadvices or tips. Thanks allyou for your help, and have a very nice day Attachment Fb_TestComs.zip (159 Downloads)
	Last edited by: TEBANCH at: 6/13/2010 9:23 PM Changes in FB200 of PLC Slave Keep working!
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6/14/2010 12:04 PM	Rate (0)
Aristotelis Posts: 147 Rating: (34)	Hi I noticed that when calling BRCV you are using M0.1 for EN & M0.1 for EN_R too. Maybe you should put 2 different variables there? Hope this helps
Aristotelis Posts: 147 Rating: (34)
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6/14/2010 3:32 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (19)	Hello Aristoteles. Thanks a lot for your reply, but ithink that is not the problem since it was programed and working ok in that way before y have maded the modifications to the FB100 block. Please check NW1 Of FB200, i wish to know if i'm doing something wrong in the logic, also please refer to FB20, thats an example of how i did test the function of "pasingIn/Out parameters of type ANY" from one FBX to another FBY, FBY is called inside FBX, in my Specific case FB200 calls FB12 andFB13, FB200 have a couple of in/out parameters called Source and Dest,those parameters are of type ANY;and lo logic in NW1 of FB200 is trying to send parameterSource to parameter SD_1 in FB13; and also in NW7 we are making the same function but in this case to trasnfer parameter Dest to parameter RD_1 in FB13. Please if somebody will like to take a loock to NW1 of FB200 i will apreciate your comments and sugestions. Thanks all you for your help, and have a very nice day.
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6/14/2010 6:08 PM	Rate (0)
TEBANCH Silver Member Joined: 3/25/2008 Last visit: 1/28/2022 Posts: 232 Rating: (19)	Hello again dear colleagues; after i have permormed some tests and changes to the project i have posted and specially in FB200, i have finded a very interesting thing: The aplication does Work OK if i do not call FB12/FB13 by means of multi-instance in FB200. If i call them by "separate" each one of them with their respective Instance DB inside FB200 there is no problem, they work pretty good, but when i change them to multi-instance call then they do not work. I can not explain why is this hapening, and i wonder if some ofyou kindly can help by explaining the cause of this strange issue, and maybe providing some advices or tips to solve it. Thanks a lot for your help, and have a very nice day.
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6/15/2010 9:39 AM	Rate (0)
Aret Posts: 2348 Rating: (259)	What error codes it gives?
Aret Posts: 2348 Rating: (259)
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6/15/2010 2:22 PM	Rate (3)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 6/5/2023 Posts: 2966 Rating: (1025)	Hello TEBANCH you didn't set yourself a beginners task with this, so first of all" good on you" for trying and what you have done so far. The problems in your logic are caused by the fact that an FB uses AR2 to store its multi instance offset (irrespective if you call your FB200 itself as a multiinstance call or not). As such you woudl typically NOT use AR2 in an FB, but if you do you must be very careful and need to save it first, use it and then restore it afterwards before you acccess anyFB variables again. Anyway, attached is a pic which shows two possible solutions for you (done for NW7, the same will need to be done for NW2). Note that Solution 1 is shorter and "nicer" but does access the ANY TEMP variable by address, which meansyou loose the advantage of full symbolic access (e.g. if TEMP variable "AuxIndex" gets shifted to add more TEMPs beforehand, you must manually change the "LW" and "LD" addresses which can get easily overlooked). A solution which uses AR2 would also be possible, butis not worth the effort in my humble opinion. While Ihaven't tested the proposed solutions, they should do the job and I hope this helps. Here are also a few more links which have some more background info on the AR2 subject for you (there's also plenty of forum related discussions on this): Which operations overwrite the content of ACCU or registers in STEP 7? How do you parameterize blocks, which have "ANY"-type or "Pointer" type parameters? In the case of a function, how is the address of the ANY pointer for the elementary IN, OUT and IN-OUT parameters loaded into the address register AR1? Attachment Possible Solutions for Tebanch.jpg (249 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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