Rockwell Automation 1747-SN Remote I/O Scanner User Manual
Page 157
Publication 1747-UM013B-EN-P - January 2005
Block Transfer Examples for Earlier Processors D-29
Rung 2:5
WHEN
A
BTR
SUCCESSFULLY
COMPLETES,
BUFFER
THE
BTR
DATA
AND
UNLATCH
BOTH
THE
BTR
VIRTUAL
ENABLE
BIT
AND
THE
BTR
PENDING
BIT.
ALSO,
LATCH
THE
BIT
THAT
CONTINUES
CHECKING
THE
BTR
STATUS
UNTIL
THE
SN
MODULE
TURNS
OFF
THE
DONE
BIT.
| |
| |
| VIRTUAL |
| BTR DONE |
| BIT BTR DATA |
| N7:60 +COP---------------+ |
|----] [----------------------------------------------+-+COPY FILE +-+-|
| 13 | |Source #M1:1.110| | |
| | |Dest #N7:0| | |
| | |Length 10| | |
| | +------------------+ | |
| | | |
| | | |
| | | |
| | BTR | |
| | PENDING | |
| | B3 | |
| +----(U)---------------+ |
| | 0 | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ENABLE | |
| | BIT | |
| | N7:50 | |
| +----(U)---------------+ |
| | 15 | |
|
|
|
|
|
|
|
|
| | | |
| | | |
| | | |
| | CHECK BTR | |
| | STATUS | |
| | B3 | |
| +----(L)---------------+ |
| 2 |
Rung 2:6
WHEN A BTR UNSUCCESSFULLY COMPLETES, BUFFER THE ERROR CODE AND UNLATCH THE BTR
ENABLE BIT AND THE BTR PENDING BIT. ALSO, LATCH THE CHECK BTR STATUS BIT IN
ORDER TO CONTINUE READING THE STATUS INFORMATION FROM THE SCANNER UNTIL IT
TURNS THE ERROR BIT OFF, COMPLETING THE HAND-SHAKE PROCESS.
| |
| |
| BTR ERROR |
| BIT |
| N7:60 +MOV---------------+ |
|----] [----------------------------------------------+-+MOVE +-+-|
| 12 | |Source M1:1.103| | |
| | | *| | |
| | |Dest N7:21| | |
| | | 0| | |
| | +------------------+ | |
| | | |
| | | |
| | | |
| | BTR | |
| | PENDING | |
| | B3 | |
| +----(U)---------------+ |
| | 0 | |
| | | |
| | | |
| | VIRTUAL | |
| | BTR ENABLE | |
| | BIT | |
| | N7:50 | |
| +----(U)---------------+ |
| | 15 | |
| | | |
| | | |
| | | |
| | CHECK BTR | |
| | STATUS | |
| | B3 | |
| +----(L)---------------+ |
| 2 |