Rockwell Automation 1771-IE,D17716.5.7 ANAL.INPUT MOD. - Manual (Page 36)

Block Transfer (Multiple GET) for PLC-2/20
Appendix A
AĆ3
Scan 1
Rung 9
This rung controls block transfer. Preconditions are optional. The first
available word 030 in the timer/counter accumulated area stores module
location 120. Word 130 in the timer/counter preset area stores the address
of the first word in the BTR (buffer) file.
Output bit 01207 initiates block transfer. The first digit of this output
address is zero, because it is in the output image table. The next three
digits are the module’s location: rack, module group, and slot numbers.
The last digit, 7, is the BTR enable bit (bit 17 if the module was in slot 1).
Rung 10
Bit 01207 is examined to determine if a block transfer was initiated. If
initiated, Bit 02000 is latched until the next program scan.
Scan 2
Rung 1
This rung detects the request (02000) and completion (11207) of a block
transfer to this module. Upon completion, it lets transferred data move to
storage location words 150-157 in rungs 11-17.
Rung 2
This rung resets the block transfer operation. Bit 02000 is unlatched. It
will be latched again if a block transfer request is made this program scan.
Rungs 3 Ć 7
These rungs determine the block length by setting a binary code equal to
the number of words transferred.
Description