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WIncc Flexible 2008 Change connection on PC

Created by: Raymondk at: 6/27/2009 11:49 AM (8 Replies)

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6/27/2009 11:49 AM	Rate (0)
Raymondk Posts: 62 Rating: (0)	Dear Forum users, Icurrently have a redundant project usingCPU315-2 PN/DP which is connected to a Engineering Station PC via Ethernet. On the PC i have WinccFlexible 2008 with Runtime. I am trying to configure the chnage connection which i notice the connection will change the first time around but not back again. Example: IP Add for PLC1 (Connection_4) is 192.168.0.4 IP Add for PLC2(Connection_5) is 192.168.0.5 I am using the master reserve bit DBX9.1 fromredundant work DB5 from PLC2 to carryout the chagne connection. DB5.DBX9.1 = 0, PLC2 is master DB5.DBX9.1 = 1, PLC is reserve. WhenDBX9.,1= 1, the connection changes over from PLC2 (Connection_5) to PLC1 (Connection_4) andWinCCRT on the PC updates finereading from PLC1 butwhen i switch back PLC2 to be master the connection remains on PLC1 so nowWinCCon the PC does not read. IfI make the change to be PLC1 to PLC 2 first it works but not back. I dont know why i am not able to get theConnections switchingboth ways. If any one have done this before please share your results as i will be thnakfull for this. Thank you all, Raymondk Attachment change connection from PLC2 to PLC1.JPG (821 Downloads)
Raymondk Posts: 62 Rating: (0)
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6/27/2009 12:13 PM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, Every time tag DB5.DBX9.1 is changed you allways change your connection to "Connection_5". You must evalueate tag value and change connection according to value: for example tag changed and its value is 0 then change to "Connection_5" and respectively if tag changed and its value is 1 then change to "Connection_4". The best way is to write a script with one parameter which will be changed tag value and then do something like this in the script: If tag_value Then ChangeConnection "Connection_4","192.168.0.4",2, 0 End If ChangeConnection "Connection_5", "192.168.0.5", 0, 0 Use this script in tag event "change value"
	Last edited by: Darius at: 6/27/2009 12:22 PM Best regards, Darius
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6/27/2009 12:27 PM	Rate (0)
Raymondk Posts: 62 Rating: (0)	Thank you sir, Will do. I will get back to you and let you know how i got on. Thanks, Raymondk.
Raymondk Posts: 62 Rating: (0)
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6/27/2009 1:25 PM	Rate (0)
H-H Platinum Member Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)	Hello Raymondk, Darius' solution is good. I never did it but I hope it will work. However, If you still like to do it without scripts, you can use this link to learn how to handle change connection between 2 PLCs. It's talking about WinCC flexible with H-System but the core of solution is the same with SWR. Best regards. H-H

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This contribution was helpful to 1 thankful Users Darius

6/29/2009 4:22 PM	Rate (0)
Raymondk Posts: 62 Rating: (0)	Darius, Please look at the attachment. It shows my configuration and script for the change connection. EverytimeI complie i am getting an error. If i do not call the script in Tag event Change Value then i am able to complie. Is this script OK? Thanks, Raymondk Attachment Change connection script.JPG (784 Downloads)
Raymondk Posts: 62 Rating: (0)
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6/29/2009 7:58 PM	Rate (0)
Darius Platinum Expert Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, I've created simple script for you which compiles, but I didn't tested it. You can test it by yourself. See attachment for details. Attachment screen_001.zip (627 Downloads)
	Best regards, Darius
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6/30/2009 9:12 AM	Rate (0)
ZAK Gold Member Joined: 5/8/2006 Last visit: 10/16/2024 Posts: 1085 Rating: (78)	Hi Your should write the "If ... then" command in the same line, then it should work. Bye

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7/8/2009 9:44 PM	Rate (0)
Raymondk Posts: 62 Rating: (0)	Hello All, I think i have the Change connection working now.I dicovered some things that i thought i would share with you all forsome feedback and comments about my thoughts and findings and if there is any thing else i should know or if this is correct or not. The following is a working example of a Change Connection function in WinCC Flexible 2008 my means of script. The WinCC project is an integrated project in Step7 which is being used with runtime on a PC as the operator station (OS). The OS is connected to the Redundant CPU’s via an Ethernet connection. PLC used · Two (2) CPU 315-2 PN/DP with integrated Ethernet port Plan Objectives · PLC1 Ethernet Connection has been named Connection_4 · PLC2 Ethernet Connection has been named Connection_5 · PLC2 will be used as the default master (Connection_5) · In WinCC Flex all the graphics has been tag to CPU2 (Connection_5) · Bit M1000.1 in PLC1 will be used to activate the (Script) Change Connection. The script will break Connection_5 and change all tags in WinCC Flex that has been tag to Connection_5 during development over to Connection_4. Bit M1000.1=1 · When Bit M1000.1=0 the script will change all connections back to Connection_5 Discussion 1 over Discovery It has been notice during the test that once the connection was change from Connection_5 to Connection_4 it would not go back to Connection_5 once PLC2 was master again and the OS would not update values from PLC2. Reason: When the tags are created in WinCC Flex the connection stated at that time would be the default connection. What the script does in WinCC flex is change the connection as the script is written but the default connection is still assigned to the tag. This means that when the Bit changes state for the connection to go back from Connection_4 to 5 it would not change because there is no tags with the default Connection_4. All the tags were created with Connection_5. So what the script should say is (Else Change Connection_5 back to Connection_5). Please see Script above.Discussion 2 over Discovery It was also notice that the Bit M1000.1 which is being used to call the script must be on all the screen in order for the screen to be updated by the PLC after a connection has been change. To satisfy this, the Bit M1000.1 was used to display the status on the PLC as to which PLC is Master. This allowed the Bit to be used on the screen at the same time. This was place on the Template Screen in the Top Heading area. Thanks allot for all the Help once again. Raymondk Attachment Change connection script.JPG (676 Downloads)
Raymondk Posts: 62 Rating: (0)
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7/9/2009 12:37 PM	Rate (0)
ZAK Gold Member Joined: 5/8/2006 Last visit: 10/16/2024 Posts: 1085 Rating: (78)	Hi 1. Discussion If you want to change your connection back, then you can only set M1000.1=0 in the PLC2 (Connection_4) because you have no connection to PLC 1 (Connection_5). The panel doesn't know the changing of the flag M1000.1 in the PLC1. 2. Discussion You can set your acquisition mode of tag to "cyclic continuous" in the tag editor. The panel gets in each cases thechanging of tag from the plc. It's dependson the acquisition cycle. Link: http://support.automation.siemens.com/WW/view/en/23842653 May this entry will help you, too: http://support.automation.siemens.com/WW/view/en/35538370 Bye
	Last edited by: ZAK at: 7/9/2009 12:38 PM Last edited by: ZAK at: 7/9/2009 12:37 PM
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