Allen-Bradley 1747-SN User Manual page 118

Rung 2:7
WHEN A BTW SUCCESSFULLY COMPLETES, UNLATCH THE BTW ENABLE BIT AND THE BTW
PENDING BIT TO COMPLETE A BTW SEQUENCE. ALSO, LATCH THE BIT THAT CONTINUES
CHECKING THE BTW STATUS UNTIL THE SN MODULE TURNS THE DONE BIT OFF.
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| VIRTUAL
| BTW DONE
| BIT
| N7:64
|––––] [––––––––––––––––––––––––––––––––––––––––––––––––––––––––+––––(U)–––––+–|
| 13
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Rung 2:8
WHEN A BTW UNSUCCESSFULLY COMPLETES, BUFFER THE ERROR CODE AND UNLATCH THE BTW
ENABLE BIT AND THE BTW PENDING BIT. ALSO, LATCH THE CHECK BTW 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
| BTW ERROR
| BIT
| N7:64
|––––] [––––––––––––––––––––––––––––––––––––––––––––––+–+MOVE
| 12
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RIO Block Transfer
BTW
PENDING
B3
| 1
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| VIRTUAL
| BTW ENABLE | |
| BIT
| N7:53
+––––(U)–––––+ |
| 15
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| CHECK BTW
| STATUS
| B3
+––––(L)–––––+ |
3
BTW ERROR
CODE
+MOV–––––––––––––––+
+–+–|
| |Source M1:1.203| | |
| | *| | |
| |Dest N7:1| | |
| | 0| | |
| +––––––––––––––––––+ | |
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| BTW
| PENDING
| B3
+––––(U)–––––––––––––––+ |
| 1
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| VIRTUAL
| BTW ENABLE
| BIT
| N7:53
+––––(U)–––––––––––––––+ |
| 15
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| CHECK BTW
| STATUS
| B3
+––––(L)–––––––––––––––+ |
3
Publication 1747 6.6 - July 1996
5–41
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