Block Transfer Write Control Logic Example - Allen-Bradley 1747-SN User Manual

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.
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| USER LOGIC|
| TO |VIRTUAL
| INITIATE A|BT ENABLE |BTR DONE
| BTR |BIT
| I:2.0 B3:100
|––––] [––––––––]/[––––––––]/[––––––––]/[–––––––––––––––––––––––+––––(L)–––––+–|
| 0 15
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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
|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––––––+MOVE
| | 15 |
| | |
| | |
| | |
| | |
| | |
| | |
| | VIRTUAL |
| | BTR DONE |
| | BIT |
| | B3:0 |
| +––––] [–––––+
| | 13 |
| | |
| | |
| | VIRTUAL |
| | BTR ERROR |
| | BIT |
| | B3:0 |
| +––––] [–––––+
| 12
Rung 2:7
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|–––––––––––––––––––––––––––––––––––––+END+––––––––––––––––––––––––––––––––––––|
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Rung 2:0
CONFIGURE THE BTW LENGTH AND RIO ADDRESS AT POWER–UP. ALSO, BE SURE THE BLOCK
TRANSFER OPERATION BIT IS A "0" INDICATING A BTW. ALL THESE PARAMETERS MUST BE
ENTERED PRIOR TO PLACING THE PROCESSOR IN THE RUN MODE.
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| POWER–UP
| BIT
| S:1
|––––] [––––––––––––––––––––––––––––––––––––––––––––––––––+COPY FILE
| 15
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|VIRTUAL |VIRTUAL
|BTR ERROR
|BIT |BIT
B3:0 B3:0
13 12

Block Transfer Write Control Logic Example

RIO Block Transfer
SERVICE
THE BTR
STATUS/
BTR
PENDING
B3:5
| 0 | |
| | |
| | |
| VIRTUAL | |
| BT ENABLE | |
| BIT | |
| B3:100 | |
+––––(L)–––––+ |
15
+MOV–––––––––––––––+ |
+–|
|Source B3:100| |
| 0000000000000000| |
|Dest M0:1.100| |
| *| |
+––––––––––––––––––+ |
+COP–––––––––––––––+ |
+–|
|Source #B3:100| |
|Dest #M0:1.100| |
|Length 3| |
+––––––––––––––––––+ |
Publication 1747 6.6 - July 1996
5–25
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