Rockwell Automation 1395 Node Adapter Board - Manual (Page 26)

Chapter 3
Functional Description
3-14
Three bits must be off to allow the execution of the BTW. The first, I : 10 /
11 is set when a block transfer Write to the Node Adapter board is in
progress. The second (I : 010 / 12) is the Read available bit. The last is the
block transfer wait (I : 010 / 13) bit. This bit indicates that a message has
been sent to the drive and is awaiting a response.
Two branches are included for error handling. If I;10/14 is set, then the
Node Adapter has received an incorrect blcok transfer request from the
PLC. When this occurs, the BTW is re-enabled. The second branch handles
the case where the BTW has not been completed within 8 seconds. The
BTW will also be re-enabled when this happens.
There are two conditions that must be satisfied before the second BTR is
executed. The block transfer Write done bit (N111: 0/13), and the read
available bit (I:010/12) must be set. If the block transfer read is successful,
the done bit (N111: 45/13) is set and the block transfer operation is
complete.