Installation manual

Publication 1747-RM001G-EN-P - November 2008
Block Transfer Instructions 8-11
Comparison to the PLC-5 BTR and BTW
BTR/BTW in SLC processors are quite similar to the instructions in the
PLC-5. However, some differences exist between them, as shown in the table
below.
Table 8.6 Block Transfer Comparison
Parameter SLC PLC-5
Control Block 3-element integer (N) type 5-element integer (N) type or 1-element
block transfer (BT) type.
EN (Enable Bit) Follows BT rung state. Gets set when BT rung goes true. Remains
set until the BT finishes or fails, and the BT
rung goes false.
NR (No Response bit) None This bit is in control block word 0 bit 9.
CO (Continuous bit) None This bit is in control block word 0 bit 11.
FILE (File Number) None This word is control block word 3.
ELEM (Element Number) None This word is control block word 4.
Error Codes 7 error codes 11 error codes
BTR/BTW number limitation for one
scanner/channel
32 64
BT Status Bits Can only change when BT rung is scanned. Can change at any point in the program
scan.
IMPORTANT
Do not manipulate the I/O image words of the RIO
scanner for modules you are block transferring to.
These words are used by the RIO scanner and the
remote device as block transfer handshake bits. Any
manipulation of them by the user program while a
block transfer is in progress causes the block transfer
to fail.