Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual User Manual

Page 76

Text mode
Original mode

Planning Your System Programs

Chapter 6

6-5

We recommend that you then create a rough-draft SFC to represent the
operation (see Figure 6.2).

Figure 6.2

Drill Machine Example Functional Specification

initialization

conveyor forward

010 AUTO operator starts cycle

011 LS1 wood in position

012 LS4 hole drilled

013 TMR1 dwell timer done

014 LS2 station home

015 LS5 wood ejected

drill

dwell

reverse drill

eject

Step

Transition

Creating the Detailed Analysis for Your Functional Specification

Begin determining the details of your process as discussed in chapter 1,
“Understanding Your System.” Identify the hardware requirements.
Table 6.C identifies hardware requirements for the inputs and outputs of
the drill machine.