Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 136)

Block Format Instructions
Chapter 10
10Ć14
Task 3: Completing Your Worksheets
Figure 10.1 and Figure 10.2 illustrate completed sequencer worksheets. Notice
that the first step of the sequencer output is the last step of your operation.
Table 10.A describes each step. To aid you in understanding this documentation
concept, read Table 10.A while looking at each figure.
Table 10.A
NOTE: Read this table from left to right while looking at Figure 10.1 and
Figure 10.2.
Sequencer Input Instruction Sequencer Output Instruction
Step 2 Ć A photocell detects a bottle.
Step 1 Ć Automation begins.
NOTE: This process is fully autoĆ
mated, therfore each block in each
step is filled.
Step 2 Ć Conveyor motor is started,
and the forward motion begins.
Step 3 Ć Fill tue motor and its forward
motion begins. The conveyor motor is
on, but not moving forward.
Step 3Ć The fill tube extension
begins closing limit switch 1.
Step 4 Ć Bit 15 of the timer is set.
Step 5 Ć The fill tube retraccts
closing limit switch 2.
Step 6 Ć The process is left in
automation waiting for more bottles
Step 4 Ć The fill tube begins filling the
bottles, bit 17 of the timer is set.
Step 5 Ć Filling is completed.
Step 6 Ć A solenoid moves the bottles to
the next operation; the conveyor moves
forward.
Step 1 Ć The conveyor moves forward