Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 76)

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.