Allen-Bradley 1747-SN User Manual page 117

5–40 RIO Block Transfer
Rung 2:5
WHEN A BTR SUCCESSFULLY COMPLETES, BUFFER THE BTR DATA AND UNLATCH BOTH THE
BTR VIRTUAL ENABLE BIT AND THE BTR PENDING BIT. ALSO, LATCH THE BIT THAT
CONTINUES CHECKING THE BTR STATUS UNTIL THE SN MODULE TURNS OFF THE DONE BIT.
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| VIRTUAL
| BTR DONE
| BIT
| N7:60
|––––] [––––––––––––––––––––––––––––––––––––––––––––––+–+COPY FILE
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Rung 2:6
WHEN A BTR UNSUCCESSFULLY COMPLETES, BUFFER THE ERROR CODE AND UNLATCH THE BTR
ENABLE BIT AND THE BTR PENDING BIT. ALSO, LATCH THE CHECK BTR STATUS BIT IN
ORDER TO CONTINUE READING THE STATUS INFORMATION FROM THE SCANNER UNTIL IT
TURNS OFF THE ERROR BIT, COMPLETING THE HAND–SHAKE PROCESS.
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| VIRTUAL
| BTR ERROR
| BIT
| N7:60
|––––] [––––––––––––––––––––––––––––––––––––––––––––––+–+MOVE
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Publication 1747 6.6 - July 1996
13
12
BTR DATA
+COP–––––––––––––––+
+–+–|
| |Source #M1:1.110| | |
| |Dest #N7:0| | |
| |Length 10| | |
| +––––––––––––––––––+ | |
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| BTR
| PENDING
| B3
+––––(U)–––––––––––––––+ |
| 0
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| VIRTUAL
| BTR ENABLE
| BIT
| N7:50
+––––(U)–––––––––––––––+ |
| 15
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| CHECK BTR
| STATUS
| B3
+––––(L)–––––––––––––––+ |
2
BTR ERROR
CODE
+MOV–––––––––––––––+
+–+–|
| |Source M1:1.103| | |
| | *| | |
| |Dest N7:0| | |
| | 0| | |
| +––––––––––––––––––+ | |
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| BTR
| PENDING
| B3
+––––(U)–––––––––––––––+ |
| 0
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| VIRTUAL
| BTR ENABLE
| BIT
| N7:50
+––––(U)–––––––––––––––+ |
| 15
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| CHECK BTR
| STATUS
| B3
+––––(L)–––––––––––––––+ |
2
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