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Word to Bit access/ DB Pointer

Created by: counter at: 4/9/2015 4:56 PM (6 Replies)

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4/9/2015 4:56 PM	Rate (0)
counter Posts: 46 Rating: (1)	Requirement: I will Put value in MW324. Corresponding bit of DB90 will be activated and rest of the bits of that DB will be Deactivated. e.g: // If MW324=10 then DB90.DBX1.1 will be set and all other bits of DB90 will be zero // If MW324=11 then DB90.DBX1.2 will be set and all other bits of DB90 will be zero My code is below: L MW 324 // Value to put ITD T MD 326 OPN DB 90 L MD 326 Lop1: T #Lno // #Lno id temp DW L #Lno L MD 326 ==D S DBX [#Lno] JC END1 R DBX [#Lno] END1: L #Lno LOOP Lop1 Problem is DBX [#Lno] is not accepting the address value #Lno. PLC goes Stop mode. Thanks
counter Posts: 46 Rating: (1)
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4/9/2015 6:36 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	Hello, You need some modifications in your programming syntax: OPN DB 1 L 200 // number of bits in an array lp: T #lp L #lp ITD L P#DBX 0.0 +D LAR1 //check A( L MW 324 //set value L #lp ==I ) JCN end1 SET = DBX [AR1,P#0.0] JU end2 end1: NOP 0 CLR = DBX [AR1,P#0.0] end2: NOP 0 L #lp LOOP lp I hope this helps you, hdhosseini
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This contribution was helpful to 2 thankful Users William_B counter

4/10/2015 8:13 AM	Rate (0)
counter Posts: 46 Rating: (1)	Thanks hdhosseini I have tried to run the code as you suggested, Unfortunately still PLC goes to Stop mode end1: NOP 0 CLR = DBX [AR1,P#0.0] Above is the code for resetting each bit. And I checked If I commented out the last line (e.g: // = DBX [AR1,P#0.0]) ) then PLC goes to Run mode, is the reason why PLC goes to stop mode. Looks like accessing the Address register or accessing the Bit of that particular address register for the false condition is not allowed. Pls suggest.. Thanks
counter Posts: 46 Rating: (1)
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4/10/2015 8:51 AM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	It will STOP if you only COPY-->PASTE my STL piece of code to your project.Your loop counter, should match the exact existing number of bits in the DB.I have had 200 bits in my DB .I share the whole project with modification for bit #0: OPN DB 1 L 201 // number of bits in an array lp: T #lp L #lp DEC 1 ITD L P#DBX 0.0 +D LAR1 //check A( L #lp DEC 1 L MW 324 //set value ==I ) JCN end1 SET = DBX [AR1,P#0.0] JU end2 end1: NOP 0 CLR = DBX [AR1,P#0.0] end2: NOP 0 L #lp LOOP lp Attachment MODIFIED.jpg (169 Downloads)
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This contribution was helpful to 1 thankful Users lad_stl

4/10/2015 8:53 AM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	No content The text field of the post has no content yet Attachment Forum_e.zip (142 Downloads)
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4/10/2015 9:53 AM	Rate (0)
counter Posts: 46 Rating: (1)	Yah .. Size of DB must match together or greater then the Loop counter. Again thanks..
counter Posts: 46 Rating: (1)
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This contribution was helpful to 1 thankful Users hdhosseini

4/16/2015 11:12 AM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating: (71)	Just an after thought....If in case at any given time DB90 has only one bit set then you can do without loop like this.. L MW 324 //new value comes here L MW 320 //last value is here <>I JCN end1 OPN DB 90 L MW 320 ITD LAR1 P#DBX 0.0 +AR1 R [AR1,P#0.0] //reset old bit position L MW 324 ITD LAR1 P#DBX 0.0 +AR1 S [AR1,P#0.0] //set new bit position L MW 324 T MW 320 end1: NOP 0
	Last edited by: manmeet at: 4/16/2015 11:14:16 AM Last edited by: manmeet at: 4/16/2015 11:17:15 AM Last edited by: manmeet at: 4/16/2015 11:18:02 AM
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