Installation manual

Publication 1747-RM001G-EN-P - November 2008
8-4 Block Transfer Instructions
Figure 8.1 Successful Block Transfer
Successful Block Transfer Read/Write
Figure 8.1 illustrates a successful BT operation.
1. The SLC control program copies new data to the data file (BTW only)
and solves the BT rung true, which sets the enable (EN) bit.
2. The scanner detects that the EN bit is set, validates the control block
information, puts the BT request on the RIO link successfully, and since
no other BTs are pending for the same logical rack, sets the enable
waiting (EW) and start (ST) bits.
3. The scanner receives a BT reply (with no errors) from the RIO link
device, copies the received data to the data file (BTR only) and sets the
done (DN) bit.
4. The SLC control program detects the DN bit, processes the BTR data
and solves the BT rung false, which clears the enable (EN) bit.
5. The scanner detects that the SLC control program has completed
processing (because the EN bit is clear) and clears the EW, ST and DN
bits. At this point, the SLC control program could re-initiate the same
BT operation by solving the BT rung true again.
Control Bits
Status Bits
EN
TO
EW
ST
ER
DN
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Control Information
Status Information