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Publication 1747-UM013B-EN-P - January 2005
Block Transfer Examples for Earlier Processors
D-3
Rung 2:5
WHEN USER LOGIC INITIATES A NEW BTR, LATCH THE ENABLE BIT , AS LONG AS A BTR IS
NOT IN PROGRESS. ALSO, LATCH THE BTR PENDING BIT , SO THE BTR STATUS FILE WILL
BE READ BY THE LADDER PROGRAM.
| | | | SERVICE |
| USER LOGIC| | | THE BTR |
| TO |VIRTUAL |VIRTUAL |VIRTUAL STATUS/ |
| INITIATE A|BT ENABLE |BTR DONE |BTR ERROR BTR |
| BTR |BIT |BIT |BIT PENDING |
| I:2.0 B3:100 B3:0 B3:0 B3:5 |
|----] [--------]/[--------]/[--------]/[-----------------------+----(L)-----+-|
| 0 15 13 12 | 0 | |
| | | |
| | | |
| | VIRTUAL | |
| | BT ENABLE | |
| | BIT | |
| | B3:100 | |
| +----(L)-----+ |
| 15 |
Rung 2:6
MOVE THE VIRTUAL CONTROL WORD TO THE M0 FILE FOR THE SN MODULE WHENEVER A
TRANSITION OF THE BTR ENABLE BIT OCCURS.
| |
| |
| VIRTUAL |
| BT ENABLE |
| BIT |
| B3:100 +MOV---------------+ |
|-+----] [-----+------------------------------------------+MOVE +-|
| | 15 | |Source B3:100| |
| | | | 0000000000000000| |
| | | |Dest M0:1.100| |
| | | | *| |
| | | +------------------+ |
| | | |
| | | |
| | VIRTUAL | |
| | BTR DONE | |
| | BIT | |
| | B3:0 | |
| +----] [-----+ |
| | 13 | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ERROR | |
| | BIT | |
| | B3:0 | |
| +----] [-----+ |
| 12 |
Rung 2:7
| |
|-------------------------------------+END+------------------------------------|
| |
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