Rockwell Automation 1771-IXE/D Thermocouple/Millivolt Input Module User Manual - Manual (Page 25)

3–3 Module Programming
Publication 1771Ć6.5.130 Ć May 1999
Program Action
Rung 1 – Block transfer read buffer: the file–to–file move
instruction holds the block transfer read (BTR) data (file A) until the
processor checks the data integrity.
1. If the data was successfully transferred, the processor energizes
the BTR done bit, initiating a data transfer to the buffer (file R)
for use in the program.
2. If the data is corrupted during the BTR operation, the BTR done
bit is not energized and data is not transferred to the buffer file. In
this case, the data in the BTR file will be overwritten by data
from the next BTR.
Rungs 2 and 3 – These rungs provide for a user–initiated block
transfer write (BTW) after the module is initialized at power–up.
Pressing the pushbutton locks out BTR operation and initiates a
BTW that configures the module. Block transfer writes will continue
for as long as the pushbutton remains closed.
Rungs 4 and 5 – These rungs provide a ”read–write–read” sequence
to the module at power–up. They also ensure that only one block
transfer (read or write) is enabled during a particular program scan.
Rungs 6 and 7 – These rungs are the conditioning block transfer
rungs. Include all the input conditioning shown in the example
program.