Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 155)

Special Programming Techniques
Chapter 11
11Ć8
Refer to the user’s manual for additional information on the block transfer
module of interest or consult our Publication Index (publication SD499).
The programming example shown in Figure 11.2 shows how multiple reads of
different block lengths from one module can be programmed. when any one of
the input switches is closed, the rung is enabled and the block length is
established. The last rung enables the block transfer instruction regardless of
the previous changes in status of the enable bit. The examine off instructions
prevent more than one of the block transfer instructions from being energized in
the same scan.
Figure 11.2
Programming Multiple Reads from One Module
EN
052
141
04
160- 167
DN
1 014
17
114
17
2 3
INPUTS
EN
052
141
08
160- 167
DN
1 014
17
114
17
2 3
INPUTS-
EN
Block XĆFer Read
052
141
03
160- 167
DN
1 014
17
114
17
2 3
INPUTS
1
2
3
014
17
INPUT
INPUT
INPUT
Data Addr:
Module Addr:
Block Length:
File:
Block XĆFer Read
Data Addr:
Module Addr:
Block Length:
File:
Block XĆFer Read
Data Addr:
Module Addr:
Block Length:
File: