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Publication 1747-UM013B-EN-P - January 2005
Block Transfer Examples for Earlier Processors
D-13
Rung 2:0
CONFIGURE THE BTR OPERATION TYPE, LENGTH AND RIO ADDRESS AT POWER-UP. BIT
B3:100/7 MUST BE SET PRIOR TO GOING TO RUN TO INDICATE A BTR OPERATION.
| |
| |
| |
| POWER-UP BTR |
| BIT CONTROL |
| S:1 +COP---------------+ |
|----] [--------------------------------------------------+COPY FILE +-|
| 15 |Source #B3:100| |
| |Dest #M0:1.100| |
| |Length 3| |
| +------------------+ |
Rung 2:1
COPY THE BTR STATUS AREA TO A BINARY FILE WHICH WILL BE USED THROUGHOUT THE
PROGRAM. THIS AVOIDS ADDRESSING THE M1 FILE MULTIPLE TIMES DURING EACH PROGRAM
SCAN. EACH TIME AN INSTRUCTION CONTAINING AN M1 FILE BIT, WORD OR FILE IS
SCANNED BY THE PROCESSOR, AN IMMEDIATE DATA TRANSFER TO THE MODULE OCCURS AND
THEREFORE WILL IMPACT THE OVERALL PROCESSOR SCAN TIME.
| |
| |
| |
| BTR |
| PENDING BTR STATUS |
| B3 +COP---------------+ |
|-+----] [-----+------------------------------------------+COPY FILE +-|
| | 80 | |Source #M1:1.100| |
| | | |Dest #B3:0| |
| | | |Length 4| |
| | | +------------------+ |
| | | |
| | | |
| | | |
| | CHECK BTR | |
| | STATUS | |
| | B3 | |
| +----] [-----+ |
| 81 |
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.
| |
| |
| VIRTUAL |
| BTR DONE CHECK BTR |
| BIT STATUS |
| B3 B3 |
|-+----]/[-----+-------------------------------------------------------(U)-----|
| | 13 | 81 |
| | | |
| | | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ERROR | |
| | BIT | |
| | B3 | |
| +----]/[-----+ |
| 12 |
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