Application Example Programs
E–19
Data Files
Address 15 Data 0
N7:0 0000 0000 0000 0000
N7:1 0000 0000 0000 0100
N7:2 0000 0000 0000 0010
N7:3 0000 0000 0000 0001
Data Table
Address Data (Radix=Decimal)
N7:0 0 4 2 1 0 0 6000 1500 3000
Event Driven Sequencer Application Example
The following application example illustrates how the FD (found) bit on an SQC
instruction can be used to advance an SQO to the next step (position). This
application program is used when a specific order of events is required to occur
repeatedly
. By using this combination, you can eliminate using the XIO, XIC, and
other instructions. For a detailed explanation of:
• XIC, XIO, and RES instructions, see chapter 6.
•
SQO and SQC instructions, see chapter 1
1.
Event Driven Sequencer Ladder Program
Rung 2:0
Ensures that the SQO always resets to step (position) 1 each REM Run
mode entry. (This rung actually resets the control register’s position
and EN enable bit to 0. Due to this the following rung sees a false to
true transition and asserts step (position) 1 on the first scan.)
Eliminate this rung for retentive operation.
| S:1 R6:0 |
|––] [–––––––––––––––––––––––––––––––––––––––––––––––––––––––(RES)––––|
| 15 |
| |
Reference
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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