Rockwell Automation 1791-XXXX ANALOG BLOCK I/O - Manual (Page 53)

Chapter 6
Programming Your Analog Module
6-3
This program is very similar to the PLC-3 program with the following
exceptions:
Use enable bits instead of done bits as the conditions on each rung.
Use separate control files for each block transfer instruction. Refer to
Appendix B.
Figure 6.2
PLCĆ5 Family Sample Program Structure
EN
BTR
BLOCK XFER READ
RACK:
GROUP:
MODULE:
CONTROL:
1
0
0
N7:0
DN
DATA FILE:
LENGTH:
CONTINUOUS:
N10:0
5
N
ER
BTR Enable
15
1
EN
BTW
BLOCK XFER WRITE
RACK:
GROUP:
MODULE:
CONTROL:
1
0
0
N7:5
DN
DATA FILE:
LENGTH:
CONTINUOUS:
N10:10
27
N
ER
2
BTW Enable
15
N7:5 N7:0
EN
BTW
BLOCK XFER WRITE
RACK:
GROUP:
MODULE:
CONTROL:
1
0
0
N7:10
DN
DATA FILE:
LENGTH:
CONTINUOUS:
N10:10
3
N
ER
BTR
15 15
3
BTW
Enable Enable
N7:5 N7:0
15
N10:0
BTR
15 15
BTW
Enable Enable
PU
N7:5 N7:0
15
N10:0
PU
At powerĆup, the program enables a block
transfer read. Then, it initiates one block
transfer write to configure the module (rung 2).
Thereafter, the program continuously does
block reads and writes.
Program Action
PLCĆ5 and PLC-5/250
Program Example