Allen-Bradley 1747-SN User Manual page 129

5–52 RIO Block Transfer
Rung 2:7
WHEN A BTW SUCCESSFULLY OR UNSUCCESSFULLY 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/ERROR BIT
OFF. IN ADDITION, BUFFER THE BTW ERROR CODE IN CASE AN ERROR OCCURS.
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| VIRTUAL
| BTW DONE
| BIT
| N7:64
|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––+––––(U)–––––––––––––––+–|
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| | VIRTUAL
| | BTW ERROR
| | BIT
| | N7:64
| +––––] [–––––+
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Rung 2:8
THIS RUNG AND THE NEXT RUNG WILL TOGGLE BETWEEN EXECUTING A BTR AND A BTW.
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| VIRTUAL
| BTR ENABLE|BTW ENABLE|BTR DONE
| BIT
| N7:50
|––––]/[––––––––]/[––––––––]/[––––––––]/[–––––––––––––––––––––––+––––(L)–––––+–|
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Publication 1747 6.6 - July 1996
13 |
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12
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|VIRTUAL |VIRTUAL
|BIT |BIT
N7:53 N7:60
15 15
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|BTR ERROR
|BIT
N7:60
13 12
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
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| BTW ERROR
| CODE
| +MOV–––––––––––––––+ | |
+–+MOVE +–+ |
|Source M1:1.203|
| *|
|Dest N7:22|
| 0|
+––––––––––––––––––+
BTR
PENDING
B3
| 0
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+++
+++
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| VIRTUAL
| BTR ENABLE | |
| BIT
| N7:50
+––––(L)–––––+ |
15
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+++|
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