Rockwell Automation 1771-IR , D17716.5.76 RTD INPUT MODULE - Manual (Page 20)

Module Programming
Chapter 4
4Ć3
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 insure 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.