Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 136)

Block Format Instructions

Chapter 10

1014

Task

3: Completing Y

our 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  A photocell detects a bottle.

Step 1  Automation begins.

NOTE: This process is fully auto

mated, therfore each block in each

step is filled.

Step 2  Conveyor motor is started,

and the forward motion begins.

Step 3  Fill tue motor and its forward

motion begins. The conveyor motor is

on, but not moving forward.

Step 3 The fill tube extension

begins closing limit switch 1.

Step 4  Bit 15 of the timer is set.

Step 5  The fill tube retraccts

closing limit switch 2.

Step 6  The process is left in

automation waiting for more bottles

Step 4  The fill tube begins filling the

bottles, bit 17 of the timer is set.

Step 5  Filling is completed.

Step 6  A solenoid moves the bottles to

the next operation; the conveyor moves

forward.

Step 1  The conveyor moves forward

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 214 215

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 136