Allen-Bradley 1747-SN User Manual page 121

5–44 RIO Block Transfer
COPY THE BTR STATUS AREA TO AN INTEGER FILE ONLY WHEN A BTR IS IN PROGRESS.
THIS STATUS DATA WILL THEN BE USED THROUGHOUT THE PROGRAM AND WILL LIMIT THE
NUMBER OF M–FILE ACCESSES.
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| BTR
| PENDING
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|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––––––+COPY FILE
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| | CHECK BTR
| | STATUS
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| +––––] [–––––+
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Rung 2:2
UNLATCH THE BIT THAT CONTINUES TO CHECK THE BTR STATUS. WHEN A BTR 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 DONE/ERROR BIT
BEFORE ANOTHER BTR TO THE SAME M–FILE LOCATION CAN BE INITIATED. THIS IS ONE
COMPLETE BTR CYCLE.
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| VIRTUAL
| BTR DONE
| BIT
| N7:60
|–+––––]/[–––––+–––––––––––––––––––––––––––––––––––––––––––––––––––––––(U)–––––|
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| | VIRTUAL
| | BTR ERROR
| | BIT
| | N7:60
| +––––]/[–––––+
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Rung 2:3
COPY THE BTW STATUS AREA TO AN INTEGER FILE ONLY WHEN A BTW IS IN PROGRESS.
THIS STATUS DATA WILL THEN BE USED THROUGHOUT THE PROGRAM AND WILL LIMIT THE
NUMBER OF M–FILE ACCESSES.
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| BTW
| PENDING
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|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––––––+COPY FILE
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| | CHECK BTW
| | STATUS
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| +––––] [–––––+
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Publication 1747 6.6 - July 1996
B3
0 |
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B3 |
2
13 |
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12
B3
1 |
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B3 |
3
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BTR STATUS |
+COP–––––––––––––––+ |
+–|
|Source #M1:1.100| |
|Dest #N7:60| |
|Length 4| |
+––––––––––––––––––+ |
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CHECK BTR |
STATUS |
B3 |
2 |
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BTW |
STATUS |
+COP–––––––––––––––+ |
+–|
|Source #M1:1.200| |
|Dest #N7:64| |
|Length 4| |
+––––––––––––––––––+ |
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