Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 55)

3–11
Publication 1336 FORCE–5.13 –– September, 1998
If you receive this
status bit:
Then:
Block Transfer Ready
(Bit 10)
The SCANport device and the PLC
Communications Adapter Board are
communicating and are ready to
process block transfers.
Block Transfer Write In
Progress
(Bit 11)
A block transfer write is in progress
between the PLC controller and the
PLC Communications Adapter Board.
This bit is cleared when the data
transfer to the PLC Communications
Adapter Board is complete.
Block Transfer Read
Data Available
➀
(Bit 12)
The PLC Communications Adapter
Board has data available for the PLC
controller to read.
Block Transfer Wait
(Bit 13)
The PLC Communications Adapter
Board is processing data. This bit is
cleared when the data is available.
Block Transfer Error
➀
(Bit 14)
An error has occurred during
communications with the SCANport
device or the BTW data table is invalid.
Block Transfer Write
Available
(Bit 15)
A block transfer write is in progress
between the PLC controller and the
PLC Communications Adapter Board,
and the data is being processed by the
PLC Communications Adapter Board.
This bit is set when read data is
available.
➀
These bits are used in the PLC block transfer example program on
the following pages.
The following figure shows the bit timing information for block
transfer.
BT Write Available
BTW
BTW
Data at PLC
Communications Adapter Board
Request
BTR
Request BTR
Complete
Status Bit 15
BT Wait
Status Bit 13
BT Read Data Available
Status Bit 12
BT Write in Progress
Status Bit 11