Allen-Bradley 1747-SN User Manual page 127

5–50 RIO Block Transfer
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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| | BTR ERROR
| | BIT
| | N7:60
| +––––]/[–––––+
|
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
|
|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––––––+COPY FILE
| |
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| | CHECK BTW
| | STATUS
| |
| +––––] [–––––+
|
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.
|
|
| VIRTUAL
| BTW DONE
| BIT
| N7:64
|–+––––]/[–––––+–––––––––––––––––––––––––––––––––––––––––––––––––––––––(U)–––––|
| |
| |
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| | VIRTUAL
| | BTW ERROR
| | BIT
| | N7:64
| +––––]/[–––––+
|
Publication 1747 6.6 - July 1996
13 |
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12
B3
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B3 |
3
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12
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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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CHECK BTW |
STATUS |
B3 |
3 |
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