1747-6.22, Backup Scanner User Manual
1747-6.22, Backup Scanner User Manual
1747-6.22, Backup Scanner User Manual
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
7-150 RIO Block Transfer<br />
Publication <strong>1747</strong>-<strong>6.22</strong><br />
Bidirectional Alternating Repeating Block Transfer<br />
The following rungs demonstrate a bidirectional alternating repeating<br />
block transfer. Using these rungs ensures the block transfer requests<br />
are executed in the order in which they are sent to the queue. This<br />
example also ensures that the BTR and BTW repeatedly alternate.<br />
The XIO conditions prevent the BTR and BTW from queuing<br />
simultaneously. The BTs continue as long as the ladder rungs are<br />
scanned.<br />
Rung 2:0<br />
Configure the BT operation type, length and RIO address (R, G, S in decimal) at power-up. Bit N7:50/7 must be set to a<br />
| |<br />
| "1" to indicate a BTR and N7:53/7 must be a logical "0" to indicate a BTW operation.<br />
|<br />
| |<br />
| POWER±UP BTR |<br />
| BIT CONTROL |<br />
| S:1 +COP---------------+ |<br />
|----] [----------------------------------------------+-+COPY FILE +-+-|<br />
| 15 | |Source #N7:50| | |<br />
| | |Dest #M0:1.100| | |<br />
| | |Length 3| | |<br />
| | +------------------+ | |<br />
| | | |<br />
| | | |<br />
| | | |<br />
| | BTW | |<br />
| | OPERATION | |<br />
| | +COP---------------+ | |<br />
| +-+COPY FILE +-+ |<br />
| |Source #N7:53| |<br />
| |Dest #M0:1.200| |<br />
| |Length 3| |<br />
| +------------------+ |<br />
Rung 2:1<br />
| Copy the BTR status area to an integer file only when a BTR is in progress. This status data is then used<br />
|<br />
|<br />
throughout the program and will limit the number of M-file accesses.<br />
|<br />
| |<br />
| BTR |<br />
| PENDING BTR STATUS |<br />
| B3 +COP---------------+ |<br />
|-+----] [-----+------------------------------------------+COPY FILE +-|<br />
| | 0 | |Source #M1:1.100| |<br />
| | | |Dest #N7:60| |<br />
| | | |Length 4| |<br />
| | | +------------------+ |<br />
| | | |<br />
| | | |<br />
| | | |<br />
| | CHECK BTR | |<br />
| | STATUS | |<br />
| | B3 | |<br />
| +----] [-----+ |<br />
| 2 |