Rockwell Automation 2705 REDIPANEL KEYPAD MODULE USER MANUAL - Manual (Page 50)

Chapter 7
Programming
7–12
The ladder diagram in Figure 7.6 is a simple programming example showing
Bidirectional Block Transfers between a sub I/O scanner and PLC–5.
Read from Sub–Scanner
to the PLC–5.
Write to the Sub–Scanner
from the PLC–5
Figure 7.6
PLC–5 Block Transfer
BTR
Enable Bit
BTW
Enable Bit
BTR
Enable Bit
BTW
Enable Bit
BLOCK TRNSFR WRITE
RACK
0
GROUP 7
MODULE 1
CONTROL BLOCK N10:5
DATA FILE
N12:0
LENGTH 20
CONTINUOUS N
( ER )
( DN )
( EN )
BTW
BLOCK TRNSFR READ
RACK
0
GROUP 7
MODULE 1
CONTROL BLOCK N10:0
DATA FILE
N11:0
LENGTH 20
CONTINUOUS N
( EN )
( DN )
( ER )
BTR
] / [
N10:5
15
] / [
N10:0
15
] / [
N10:0
15
] / [
N10:5
15
The block transfer read and write instructions have certain parameters that
you must enter. The following is a description of these instruction
parameters to help you configure your block transfer instructions.
Instruction Parameters:
•
RACK refers to which I/O rack number that the sub I/O scanner is located
in. The number entered here will range from 0–3 if a PLC–5/15 is being
used or 0–7 if a PLC–5/25 is being used.
•
GROUP refers to which I/O group of the rack, that the sub I/O scanner is
located in. The number entered here will range from 0–7.
•
MODULE refers to which slot within the I/O group that the sub I/O
scanner is located. The number entered here will be 0 or 1.
•
CONTROL BLOCK is a 5–word integer file that controls the
instruction’s operation. Enter this integer file address without the #
symbol: for example, N7: (any integer file) not #N7:. This is not the file
type for control elements, R.
•
DATA FILE is the address of the block–transfer file that will be written
to, or read from, and it is from this file that the processor transfers data.
Enter this file address without the # symbol. The status of the inputs or
outputs of the remote I/O devices connected to the sub I/O scanner, will