Publication 1747-UM013B-EN-P - January 2005
D-22
Block Transfer Examples for Earlier Processors
Rung 2:0
CONFIGURE THE BT OPERATION TYPE, LENGTH, AND RIO ADDRESS (R,G,S IN DECIMAL) AT
POWER-UP. N7:50/7 MUST BE SET TO A ”1” TO INDICATE A BTR AND N7:53/7 MUST BE
A LOGICAL ”0” TO INDICATE A BTW OPERATION.
| |
| |
| |
| POWER-UP BTR |
| BIT CONTROL |
| S:1 +COP---------------+ |
|----] [----------------------------------------------+-+COPY FILE +-+-|
| 15 | |Source #N7:50| | |
| | |Dest #M0:1.100| | |
| | |Length 3| | |
| | +------------------+ | |
| | | |
| | | |
| | | |
| | BTW | |
| | CONTROL | |
| | +COP---------------+ | |
| +-+COPY FILE +-+ |
| |Source #N7:53| |
| |Dest #M0:1.200| |
| |Length 3| |
| +------------------+ |
COPY THE BTR STATUS AREA TO AN INTEGER FILE ONLY WHEN A BTR IS IN PROGRESS.
THIS STATUS DATA WILL THEN BE USED THROUGHOUT THE PROGRAM AND WILL LIMIT THE
NUMBER OF M-FILE ACCESSES.
| |
| |
| |
| BTR |
| PENDING BTR STATUS |
| B3 +COP---------------+ |
|-+----] [-----+------------------------------------------+COPY FILE +-|
| | 0 | |Source #M1:1.100| |
| | | |Dest #N7:60| |
| | | |Length 4| |
| | | +------------------+ |
| | | |
| | | |
| | | |
| | CHECK BTR | |
| | STATUS | |
| | B3 | |
| +----] [-----+ |
| 2 |
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 |
| N7:60 B3 |
|-+----]/[-----+-------------------------------------------------------(U)-----|
| | 13 | 2 |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ERROR | |
| | BIT | |
| | N7:60 | |
| +----]/[-----+ |
| 12 |
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