Allen-Bradley 1747-SN - Page 114

5–37RIO Block Transfer
Publication 17476.6 - July 1996
Rung 2:5
INITIATE A BTR FOR EACH FALSE–TO–TRUE TRANSITION OF THE USER INPUT.
| USER LOGIC |
| TO |
| INITIATE A |
| BTR |
| I:2 B3 B3 |
|––––] [––––––[OSR]–––––––––––––––––––––––––––––––––––––––––––––––––––––––(L)––|
| 0 82 83 |
Rung 2:6
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.
| | | |
| | | |
| VIRTUAL |VIRTUAL |VIRTUAL |
| BTR ENABLE|BTR DONE |BTR ERROR BTR |
| BIT |BIT |BIT PENDING |
| B3 B3 B3 B3 B3 |
|––] [–––––]/[––––––––]/[––––––––]/[––––––––––––––––––––––––––––+––––(L)–––––+–|
| 83 1615 13 12 | 80 | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ENABLE | |
| | BIT | |
| | B3 | |
| +––––(L)–––––+ |
| | 1615 | |
| | B3 | |
| +––(U)–––––––+ |
| 83 |
Rung 2:7
MOVE THE VIRTUAL CONTROL WORD TO THE M0 FILE FOR THE SN MODULE WHILE A BTR IS
IN PROGRESS, AND CONTINUE DOING SO UNTIL THE ENABLE, DONE AND ERROR BITS ARE
ALL TURNED OFF, COMPLETING THE BTR HAND–SHAKE PROCESS.
| |
| |
| VIRTUAL BTR |
| BTR ENABLE CONTROL |
| BIT WORD |
| B3 +MOV–––––––––––––––+ |
|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––––––+MOVE +–|
| | 1615 | |Source B3:100| |
| | | | 0000000000000000| |
| | | |Dest M0:1.100| |
| | | | *| |
| | | +––––––––––––––––––+ |
| | | |
| | | |
| | VIRTUAL | |
| | BTR DONE | |
| | BIT | |
| | B3 | |
| +––––] [–––––+ |
| | 13 | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ERROR | |
| | BIT | |
| | B3 | |
| +––––] [–––––+ |
| 12 |
Rung 2:8
| |
|–––––––––––––––––––––––––––––––––––––+END+––––––––––––––––––––––––––––––––––––|
| |