Allen-Bradley 1747-SN User Manual page 104

Rung 2:4
IF A BTW ERRORS, UNLATCH THE ENABLE BIT, THE BTW PENDING BIT AND BUFFER THE BTW
ERROR CODE. ALSO, LATCH THE BIT THAT CONTINUES CHECKING THE BTW STATUS UNTIL
THE SN MODULE TURNS OFF THE ERROR BIT.
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| VIRTUAL
| BTW ERROR
| BIT
| B3:0
|––––] [––––––––––––––––––––––––––––––––––––––––––––––+–+MOVE
| 12
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Rung 2:5
WHEN USER LOGIC INITIATES A NEW BTW, COPY THE DATA TO THE M0 FILE DATA AREA
AND LATCH THE VIRTUAL BTW ENABLE BIT, PROVIDED THAT A BTW IS NOT IN PROGRESS.
ALSO, LATCH THE BTW PENDING BIT, SO THE BT STATUS FILE WILL BE READ BY THE
LADDER PROGRAM.
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| USER LOGIC|
| TO |VIRTUAL
| INITIATE A|BTW ENABLE|BTW DONE
| BTW |BIT
| I:2.0 B3:100
|––––] [––––––––]/[––––––––]/[––––––––]/[–––––––––––––+–+COPY FILE
| 0 15
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|VIRTUAL |VIRTUAL
|BTW ERROR
|BIT |BIT
B3:0 B3:0
13 12
RIO Block Transfer
BUFFER BTW
ERROR CODE
+MOV–––––––––––––––+
+–+–|
| |Source B3:3| | |
| | 0000000000000000| | |
| |Dest B3:4| | |
| | 0000000000000000| | |
| +––––––––––––––––––+ | |
| SERVICE
| THE BTW
| STATUS/
| BTW
| PENDING
| B3:5
+––––(U)–––––––––––––––+ |
| 0
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| VIRTUAL
| BTW ENABLE
| BIT
| B3:100
+––––(U)–––––––––––––––+ |
| 15
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| CHECK BTW
| STATUS
| UNTIL DONE
| BIT IS OFF
| B3:5
+––––(L)–––––––––––––––+ |
1
BTW DATA
+COP–––––––––––––––+
+–+–|
| |Source #N7:110| | |
| |Dest #M0:1.110| | |
| |Length 64| | |
| +––––––––––––––––––+ | |
| SERVICE
| THE BTW
| STATUS/
| BTW
| PENDING
| B3:5
+––––(L)–––––––––––––––+ |
| 0
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| VIRTUAL
| BTW ENABLE
| BIT
| B3:100
+––––(L)–––––––––––––––+ |
15
Publication 1747 6.6 - July 1996
5–27
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