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Open two different data objects in the same Function

Created by: Xurcroh at: 9/4/2008 12:45 AM (4 Replies)

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9/4/2008 12:45 AM	Rate (0)
Xurcroh Posts: 11 Rating: (0)	Hello, anybody knows how to open and refer to two different data objects DB2 and DB3 in the same function without conflicts? Thanks
Xurcroh Posts: 11 Rating: (0)
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9/4/2008 1:33 AM	Rate (0)
Anchobi Posts: 139 Rating: (25)	Hi are you talking about having two DBs open in the one function call?
Anchobi Posts: 139 Rating: (25)
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9/4/2008 7:02 AM	Rate (0)
aikona Posts: 487 Rating: (36)	Hi Not quite sure what you would like to do but .. OPN DB20 . . Only DB20 . OPN DB30 . . Only DB30 . but you could do OPN DB20 L DBW1 Refers to DB20 T DB30.DBW1 L DBW4 Refers to DB20 Is this what your looking for ? Eric
aikona Posts: 487 Rating: (36)
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9/4/2008 7:39 AM	Rate (1)
Anchobi Posts: 139 Rating: (25)	I assume you are having an issue because you have some indirect addressing otherwise you woulduse fully qulified addressing i.e. L DB30.DBW20 L DB20.DBW58 So you can make use of the instance data block register OPN DB20 OPN DI30 L DBW[MW20] L DIW[MW22] +I T DIW 16 Or you could just opn the DB before you do an operation OPN DB20 L W [AR1,P#0.0] CAW OPN DB30 T W [AR2,P#0.0] These are some of the ways it can be done how you do it will depend on whats right for your plc program
Anchobi Posts: 139 Rating: (25)
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9/4/2008 2:37 PM	Rate (0)
Aret Posts: 2348 Rating: (264)	Dear Eric, OPN DB20 L DBW1 Refers to DB20 T DB30.DBW1 L DBW4 Refers to DB20 is wrong. T DB30.DBW1 equals OPN DB30+T DBW1, so L DBW4 Refers to DB30, but not DB20 Dear Xurcroh, please clarify what are you want to do. Generally saftiest way is (not to spoil registers) L DBNO T #Temp_DB TAR1 T #Temp_AR1 L DINO T #Temp_DI TAR2 T #Temp_AR2 Then you can changeArs,DBandDIregisters like mentioned above (or any other way you like) OPN DB 20 OPN DI 20 L DBW 0 T DIW 10 After you have done all you need - restore registers OPNDB[#Temp_DB] L#Temp_AR1 LAR1 OPNDI[#Temp_DI] L#Temp_AR2 LAR2
Aret Posts: 2348 Rating: (264)
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