Allen-Bradley 1747-SN User Manual page 122

Rung 2:4
UNLATCH THE BIT THAT CONTINUES TO CHECK THE BTW STATUS. WHEN A BTW IS
COMPLETE, THE DONE OR ERROR BIT IS SET. THE LADDER PROGRAM MUST THEN UNLATCH
THE ENABLE BIT, THEN WAIT FOR THE SN MODULE TO TURN OFF THE THE DONE/ERROR BIT
BEFORE ANOTHER BTW TO THE SAME M–FILE LOCATION CAN BE INITIATED. THIS COMPLETES
ONE BTW CYCLE.
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| VIRTUAL
| BTW DONE
| BIT
| N7:64
|–+––––]/[–––––+–––––––––––––––––––––––––––––––––––––––––––––––––––––––(U)–––––|
| | 13 |
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| | VIRTUAL |
| | BTW ERROR |
| | BIT |
| | N7:64 |
| +––––]/[–––––+
| 12
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
| 13
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RIO Block Transfer
CHECK BTW
STATUS
B3
3
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)–––––––––––––––+ |
Publication 1747 6.6 - July 1996
5–45
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