Preface – Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers User Manual

Page 362

Preface

MicroLogix 1000 Programmable Controllers User Manual

E–12

Rung 6:2
When the drill is retracting (after drilling a hole), the body of the
drill actuates the DRILL HOME limit switch. When this happens the
DRILL RETRACT signal is turned off, the DRILL SEQUENCE START bit is
turned off to indicate the drilling process is complete, and the
conveyor is restarted.

| Drill |Drill Drill |
| Home LS |Retract Retract |
| I:0 O:0 O:0 |
|––––] [––––––––] [––––––––––––––––––––––––––––––––––––+––––(U)–––––+–|
| 5 2 | 2 | |
| | Drill | |
| | Sequence | |
| | Start | |
| | B3 | |
| +––––(U)–––––+ |
| | 32 | |
| | Conveyor | |
| | Start/Stop | |
| | | |
| | O:0 | |
| +––––(L)–––––+ |
| 0 |

Rung 6.3

| |
|–––––––––––––––––––––––––––––––––––––+END+–––––––––––––––––––––––––––|
| |

Rung 7:0
Examines the number of 1/4 in. thousands that have accumulated over the
life of the current drill bit. If the bit has drilled between
100,000–101,999 1/4 in. increments of paper, the ”change drill” light
illuminates steadily. When the value is between 102,000–103,999, the
”change drill” light flashes at a 1.28 second rate. When the value
reaches 105,000, the ”change drill” light flashes, and the ”change
drill now” light illuminates.