1747-6.22, Backup Scanner User Manual

7-138 RIO Block Transfer
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 virual 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 handshake 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 |
| |
|-------------------------------------+END+------------------------------------|
| |
Publication 1747-6.22